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TAccumulate Aggregate<TSource, TAccumulate>(this IEnumerable<TSource> source, TAccumulate seed, Func<TAccumulate, TSource, TAccumulate> func);
TResult Aggregate<TSource, TAccumulate, TResult>(this IEnumerable<TSource> source, TAccumulate seed, Func<TAccumulate, TSource, TAccumulate> func, Func<TAccumulate, TResult> resultSelector);
bool All<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
bool Any<TSource>(this IEnumerable<TSource> source);
bool Any<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
IEnumerable<TSource> Append<TSource>(this IEnumerable<TSource> source, TSource element);
IEnumerable<TSource> AsEnumerable<TSource>(this IEnumerable<TSource> source);
double Average<TSource>(this IEnumerable<TSource> source, Func<TSource, int> selector);
double Average<TSource>(this IEnumerable<TSource> source, Func<TSource, long> selector);
double? Average<TSource>(this IEnumerable<TSource> source, Func<TSource, double?> selector);
float Average<TSource>(this IEnumerable<TSource> source, Func<TSource, float> selector);
double? Average<TSource>(this IEnumerable<TSource> source, Func<TSource, long?> selector);
float? Average<TSource>(this IEnumerable<TSource> source, Func<TSource, float?> selector);
double Average<TSource>(this IEnumerable<TSource> source, Func<TSource, double> selector);
double? Average<TSource>(this IEnumerable<TSource> source, Func<TSource, int?> selector);
decimal Average<TSource>(this IEnumerable<TSource> source, Func<TSource, decimal> selector);
decimal? Average<TSource>(this IEnumerable<TSource> source, Func<TSource, decimal?> selector);
float? Average(this IEnumerable<float?> source);
double? Average(this IEnumerable<long?> source);
double? Average(this IEnumerable<int?> source);
double? Average(this IEnumerable<double?> source);
decimal? Average(this IEnumerable<decimal?> source);
double Average(this IEnumerable<long> source);
double Average(this IEnumerable<int> source);
double Average(this IEnumerable<double> source);
decimal Average(this IEnumerable<decimal> source);
float Average(this IEnumerable<float> source);
IEnumerable<TResult> Cast<TResult>(this IEnumerable source);
IEnumerable<TSource[]> Chunk<TSource>(this IEnumerable<TSource> source, int size);
IEnumerable<TSource> Concat<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second);
bool Contains<TSource>(this IEnumerable<TSource> source, TSource value, IEqualityComparer<TSource>? comparer);
bool Contains<TSource>(this IEnumerable<TSource> source, TSource value);
int Count<TSource>(this IEnumerable<TSource> source);
int Count<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
IEnumerable<TSource?> DefaultIfEmpty<TSource>(this IEnumerable<TSource> source);
IEnumerable<TSource> DefaultIfEmpty<TSource>(this IEnumerable<TSource> source, TSource defaultValue);
IEnumerable<TSource> Distinct<TSource>(this IEnumerable<TSource> source);
IEnumerable<TSource> Distinct<TSource>(this IEnumerable<TSource> source, IEqualityComparer<TSource>? comparer);
IEnumerable<TSource> DistinctBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector);
IEnumerable<TSource> DistinctBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer);
TSource ElementAt<TSource>(this IEnumerable<TSource> source, Index index);
TSource ElementAt<TSource>(this IEnumerable<TSource> source, int index);
TSource? ElementAtOrDefault<TSource>(this IEnumerable<TSource> source, Index index);
TSource? ElementAtOrDefault<TSource>(this IEnumerable<TSource> source, int index);
IEnumerable<TResult> Empty<TResult>();
IEnumerable<TSource> Except<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second);
IEnumerable<TSource> Except<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second, IEqualityComparer<TSource>? comparer);
IEnumerable<TSource> ExceptBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TKey> second, Func<TSource, TKey> keySelector);
IEnumerable<TSource> ExceptBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TKey> second, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer);
TSource First<TSource>(this IEnumerable<TSource> source);
TSource First<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
TSource? FirstOrDefault<TSource>(this IEnumerable<TSource> source);
TSource FirstOrDefault<TSource>(this IEnumerable<TSource> source, TSource defaultValue);
TSource? FirstOrDefault<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
TSource FirstOrDefault<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate, TSource defaultValue);
IEnumerable<TResult> GroupBy<TSource, TKey, TElement, TResult>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, Func<TKey, IEnumerable<TElement>, TResult> resultSelector, IEqualityComparer<TKey>? comparer);
IEnumerable<TResult> GroupBy<TSource, TKey, TElement, TResult>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, Func<TKey, IEnumerable<TElement>, TResult> resultSelector);
IEnumerable<TResult> GroupBy<TSource, TKey, TResult>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TKey, IEnumerable<TSource>, TResult> resultSelector, IEqualityComparer<TKey>? comparer);
IEnumerable<TResult> GroupBy<TSource, TKey, TResult>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TKey, IEnumerable<TSource>, TResult> resultSelector);
IEnumerable<IGrouping<TKey, TSource>> GroupBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector);
IEnumerable<IGrouping<TKey, TElement>> GroupBy<TSource, TKey, TElement>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector);
IEnumerable<IGrouping<TKey, TSource>> GroupBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer);
IEnumerable<IGrouping<TKey, TElement>> GroupBy<TSource, TKey, TElement>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, IEqualityComparer<TKey>? comparer);
IEnumerable<TResult> GroupJoin<TOuter, TInner, TKey, TResult>(this IEnumerable<TOuter> outer, IEnumerable<TInner> inner, Func<TOuter, TKey> outerKeySelector, Func<TInner, TKey> innerKeySelector, Func<TOuter, IEnumerable<TInner>, TResult> resultSelector, IEqualityComparer<TKey>? comparer);
IEnumerable<TResult> GroupJoin<TOuter, TInner, TKey, TResult>(this IEnumerable<TOuter> outer, IEnumerable<TInner> inner, Func<TOuter, TKey> outerKeySelector, Func<TInner, TKey> innerKeySelector, Func<TOuter, IEnumerable<TInner>, TResult> resultSelector);
IEnumerable<TSource> Intersect<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second, IEqualityComparer<TSource>? comparer);
IEnumerable<TSource> Intersect<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second);
IEnumerable<TSource> IntersectBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TKey> second, Func<TSource, TKey> keySelector);
IEnumerable<TSource> IntersectBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TKey> second, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer);
IEnumerable<TResult> Join<TOuter, TInner, TKey, TResult>(this IEnumerable<TOuter> outer, IEnumerable<TInner> inner, Func<TOuter, TKey> outerKeySelector, Func<TInner, TKey> innerKeySelector, Func<TOuter, TInner, TResult> resultSelector);
IEnumerable<TResult> Join<TOuter, TInner, TKey, TResult>(this IEnumerable<TOuter> outer, IEnumerable<TInner> inner, Func<TOuter, TKey> outerKeySelector, Func<TInner, TKey> innerKeySelector, Func<TOuter, TInner, TResult> resultSelector, IEqualityComparer<TKey>? comparer);
TSource Last<TSource>(this IEnumerable<TSource> source);
TSource Last<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
TSource? LastOrDefault<TSource>(this IEnumerable<TSource> source);
TSource LastOrDefault<TSource>(this IEnumerable<TSource> source, TSource defaultValue);
TSource? LastOrDefault<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
TSource LastOrDefault<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate, TSource defaultValue);
long LongCount<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
long LongCount<TSource>(this IEnumerable<TSource> source);
long Max<TSource>(this IEnumerable<TSource> source, Func<TSource, long> selector);
decimal Max<TSource>(this IEnumerable<TSource> source, Func<TSource, decimal> selector);
double Max<TSource>(this IEnumerable<TSource> source, Func<TSource, double> selector);
int Max<TSource>(this IEnumerable<TSource> source, Func<TSource, int> selector);
decimal? Max<TSource>(this IEnumerable<TSource> source, Func<TSource, decimal?> selector);
TSource? Max<TSource>(this IEnumerable<TSource> source, IComparer<TSource>? comparer);
int? Max<TSource>(this IEnumerable<TSource> source, Func<TSource, int?> selector);
long? Max<TSource>(this IEnumerable<TSource> source, Func<TSource, long?> selector);
float? Max<TSource>(this IEnumerable<TSource> source, Func<TSource, float?> selector);
TResult? Max<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, TResult> selector);
double? Max<TSource>(this IEnumerable<TSource> source, Func<TSource, double?> selector);
TSource? Max<TSource>(this IEnumerable<TSource> source);
float Max<TSource>(this IEnumerable<TSource> source, Func<TSource, float> selector);
float Max(this IEnumerable<float> source);
float? Max(this IEnumerable<float?> source);
long? Max(this IEnumerable<long?> source);
int? Max(this IEnumerable<int?> source);
double? Max(this IEnumerable<double?> source);
decimal? Max(this IEnumerable<decimal?> source);
long Max(this IEnumerable<long> source);
int Max(this IEnumerable<int> source);
double Max(this IEnumerable<double> source);
decimal Max(this IEnumerable<decimal> source);
TSource? MaxBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector);
TSource? MaxBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, IComparer<TKey>? comparer);
decimal Min(this IEnumerable<decimal> source);
TResult? Min<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, TResult> selector);
float Min<TSource>(this IEnumerable<TSource> source, Func<TSource, float> selector);
float? Min<TSource>(this IEnumerable<TSource> source, Func<TSource, float?> selector);
int? Min<TSource>(this IEnumerable<TSource> source, Func<TSource, int?> selector);
double? Min<TSource>(this IEnumerable<TSource> source, Func<TSource, double?> selector);
decimal? Min<TSource>(this IEnumerable<TSource> source, Func<TSource, decimal?> selector);
long Min<TSource>(this IEnumerable<TSource> source, Func<TSource, long> selector);
int Min<TSource>(this IEnumerable<TSource> source, Func<TSource, int> selector);
decimal Min<TSource>(this IEnumerable<TSource> source, Func<TSource, decimal> selector);
TSource? Min<TSource>(this IEnumerable<TSource> source, IComparer<TSource>? comparer);
TSource? Min<TSource>(this IEnumerable<TSource> source);
long? Min<TSource>(this IEnumerable<TSource> source, Func<TSource, long?> selector);
double Min<TSource>(this IEnumerable<TSource> source, Func<TSource, double> selector);
float Min(this IEnumerable<float> source);
float? Min(this IEnumerable<float?> source);
long? Min(this IEnumerable<long?> source);
int? Min(this IEnumerable<int?> source);
double? Min(this IEnumerable<double?> source);
decimal? Min(this IEnumerable<decimal?> source);
double Min(this IEnumerable<double> source);
long Min(this IEnumerable<long> source);
int Min(this IEnumerable<int> source);
TSource? MinBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, IComparer<TKey>? comparer);
TSource? MinBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector);
IEnumerable<TResult> OfType<TResult>(this IEnumerable source);
IOrderedEnumerable<TSource> OrderBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, IComparer<TKey>? comparer);
IOrderedEnumerable<TSource> OrderBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector);
IOrderedEnumerable<TSource> OrderByDescending<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector);
IOrderedEnumerable<TSource> OrderByDescending<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, IComparer<TKey>? comparer);
IEnumerable<TSource> Prepend<TSource>(this IEnumerable<TSource> source, TSource element);
IEnumerable<int> Range(int start, int count);
IEnumerable<TResult> Repeat<TResult>(TResult element, int count);
IEnumerable<TSource> Reverse<TSource>(this IEnumerable<TSource> source);
IEnumerable<TResult> Select<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, int, TResult> selector);
IEnumerable<TResult> Select<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, TResult> selector);
IEnumerable<TResult> SelectMany<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, int, IEnumerable<TResult>> selector);
IEnumerable<TResult> SelectMany<TSource, TCollection, TResult>(this IEnumerable<TSource> source, Func<TSource, IEnumerable<TCollection>> collectionSelector, Func<TSource, TCollection, TResult> resultSelector);
IEnumerable<TResult> SelectMany<TSource, TCollection, TResult>(this IEnumerable<TSource> source, Func<TSource, int, IEnumerable<TCollection>> collectionSelector, Func<TSource, TCollection, TResult> resultSelector);
IEnumerable<TResult> SelectMany<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, IEnumerable<TResult>> selector);
bool SequenceEqual<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second);
bool SequenceEqual<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second, IEqualityComparer<TSource>? comparer);
TSource Single<TSource>(this IEnumerable<TSource> source);
TSource Single<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
TSource SingleOrDefault<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate, TSource defaultValue);
TSource SingleOrDefault<TSource>(this IEnumerable<TSource> source, TSource defaultValue);
TSource? SingleOrDefault<TSource>(this IEnumerable<TSource> source);
TSource? SingleOrDefault<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
IEnumerable<TSource> Skip<TSource>(this IEnumerable<TSource> source, int count);
IEnumerable<TSource> SkipLast<TSource>(this IEnumerable<TSource> source, int count);
IEnumerable<TSource> SkipWhile<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
IEnumerable<TSource> SkipWhile<TSource>(this IEnumerable<TSource> source, Func<TSource, int, bool> predicate);
int Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, int> selector);
long Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, long> selector);
decimal? Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, decimal?> selector);
long? Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, long?> selector);
int? Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, int?> selector);
double Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, double> selector);
float? Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, float?> selector);
float Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, float> selector);
double? Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, double?> selector);
decimal Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, decimal> selector);
long? Sum(this IEnumerable<long?> source);
float? Sum(this IEnumerable<float?> source);
int? Sum(this IEnumerable<int?> source);
double? Sum(this IEnumerable<double?> source);
decimal? Sum(this IEnumerable<decimal?> source);
long Sum(this IEnumerable<long> source);
int Sum(this IEnumerable<int> source);
double Sum(this IEnumerable<double> source);
decimal Sum(this IEnumerable<decimal> source);
float Sum(this IEnumerable<float> source);
IEnumerable<TSource> Take<TSource>(this IEnumerable<TSource> source, Range range);
IEnumerable<TSource> Take<TSource>(this IEnumerable<TSource> source, int count);
IEnumerable<TSource> TakeLast<TSource>(this IEnumerable<TSource> source, int count);
IEnumerable<TSource> TakeWhile<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
IEnumerable<TSource> TakeWhile<TSource>(this IEnumerable<TSource> source, Func<TSource, int, bool> predicate);
IOrderedEnumerable<TSource> ThenBy<TSource, TKey>(this IOrderedEnumerable<TSource> source, Func<TSource, TKey> keySelector);
IOrderedEnumerable<TSource> ThenBy<TSource, TKey>(this IOrderedEnumerable<TSource> source, Func<TSource, TKey> keySelector, IComparer<TKey>? comparer);
IOrderedEnumerable<TSource> ThenByDescending<TSource, TKey>(this IOrderedEnumerable<TSource> source, Func<TSource, TKey> keySelector);
IOrderedEnumerable<TSource> ThenByDescending<TSource, TKey>(this IOrderedEnumerable<TSource> source, Func<TSource, TKey> keySelector, IComparer<TKey>? comparer);
TSource[] ToArray<TSource>(this IEnumerable<TSource> source);
Dictionary<TKey, TSource> ToDictionary<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector) where TKey : notnull;
Dictionary<TKey, TSource> ToDictionary<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer) where TKey : notnull;
Dictionary<TKey, TElement> ToDictionary<TSource, TKey, TElement>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector) where TKey : notnull;
Dictionary<TKey, TElement> ToDictionary<TSource, TKey, TElement>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, IEqualityComparer<TKey>? comparer) where TKey : notnull;
HashSet<TSource> ToHashSet<TSource>(this IEnumerable<TSource> source, IEqualityComparer<TSource>? comparer);
HashSet<TSource> ToHashSet<TSource>(this IEnumerable<TSource> source);
List<TSource> ToList<TSource>(this IEnumerable<TSource> source);
ILookup<TKey, TElement> ToLookup<TSource, TKey, TElement>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, IEqualityComparer<TKey>? comparer);
ILookup<TKey, TElement> ToLookup<TSource, TKey, TElement>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector);
ILookup<TKey, TSource> ToLookup<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector);
ILookup<TKey, TSource> ToLookup<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer);
bool TryGetNonEnumeratedCount<TSource>(this IEnumerable<TSource> source, out int count);
IEnumerable<TSource> Union<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second);
IEnumerable<TSource> Union<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second, IEqualityComparer<TSource>? comparer);
IEnumerable<TSource> UnionBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TSource> second, Func<TSource, TKey> keySelector);
IEnumerable<TSource> UnionBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TSource> second, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer);
IEnumerable<TSource> Where<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
IEnumerable<TSource> Where<TSource>(this IEnumerable<TSource> source, Func<TSource, int, bool> predicate);
IEnumerable<(TFirst First, TSecond Second, TThird Third)> Zip<TFirst, TSecond, TThird>(this IEnumerable<TFirst> first, IEnumerable<TSecond> second, IEnumerable<TThird> third);
IEnumerable<(TFirst First, TSecond Second)> Zip<TFirst, TSecond>(this IEnumerable<TFirst> first, IEnumerable<TSecond> second);
IEnumerable<TResult> Zip<TFirst, TSecond, TResult>(this IEnumerable<TFirst> first, IEnumerable<TSecond> second, Func<TFirst, TSecond, TResult> resultSelector);
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TAccumulate Aggregate<TSource, TAccumulate>(this IEnumerable<TSource> source, TAccumulate seed, Func<TAccumulate, TSource, TAccumulate> func);
TResult Aggregate<TSource, TAccumulate, TResult>(this IEnumerable<TSource> source, TAccumulate seed, Func<TAccumulate, TSource, TAccumulate> func, Func<TAccumulate, TResult> resultSelector);
bool All<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
bool Any<TSource>(this IEnumerable<TSource> source);
bool Any<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
IEnumerable<TSource> Append<TSource>(this IEnumerable<TSource> source, TSource element);
IEnumerable<TSource> AsEnumerable<TSource>(this IEnumerable<TSource> source);
double Average<TSource>(this IEnumerable<TSource> source, Func<TSource, int> selector);
double Average<TSource>(this IEnumerable<TSource> source, Func<TSource, long> selector);
double? Average<TSource>(this IEnumerable<TSource> source, Func<TSource, double?> selector);
float Average<TSource>(this IEnumerable<TSource> source, Func<TSource, float> selector);
double? Average<TSource>(this IEnumerable<TSource> source, Func<TSource, long?> selector);
float? Average<TSource>(this IEnumerable<TSource> source, Func<TSource, float?> selector);
double Average<TSource>(this IEnumerable<TSource> source, Func<TSource, double> selector);
double? Average<TSource>(this IEnumerable<TSource> source, Func<TSource, int?> selector);
decimal Average<TSource>(this IEnumerable<TSource> source, Func<TSource, decimal> selector);
decimal? Average<TSource>(this IEnumerable<TSource> source, Func<TSource, decimal?> selector);
float? Average(this IEnumerable<float?> source);
double? Average(this IEnumerable<long?> source);
double? Average(this IEnumerable<int?> source);
double? Average(this IEnumerable<double?> source);
decimal? Average(this IEnumerable<decimal?> source);
double Average(this IEnumerable<long> source);
double Average(this IEnumerable<int> source);
double Average(this IEnumerable<double> source);
decimal Average(this IEnumerable<decimal> source);
float Average(this IEnumerable<float> source);
IEnumerable<TResult> Cast<TResult>(this IEnumerable source);
IEnumerable<TSource[]> Chunk<TSource>(this IEnumerable<TSource> source, int size);
IEnumerable<TSource> Concat<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second);
bool Contains<TSource>(this IEnumerable<TSource> source, TSource value, IEqualityComparer<TSource>? comparer);
bool Contains<TSource>(this IEnumerable<TSource> source, TSource value);
int Count<TSource>(this IEnumerable<TSource> source);
int Count<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
IEnumerable<TSource?> DefaultIfEmpty<TSource>(this IEnumerable<TSource> source);
IEnumerable<TSource> DefaultIfEmpty<TSource>(this IEnumerable<TSource> source, TSource defaultValue);
IEnumerable<TSource> Distinct<TSource>(this IEnumerable<TSource> source);
IEnumerable<TSource> Distinct<TSource>(this IEnumerable<TSource> source, IEqualityComparer<TSource>? comparer);
IEnumerable<TSource> DistinctBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector);
IEnumerable<TSource> DistinctBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer);
TSource ElementAt<TSource>(this IEnumerable<TSource> source, Index index);
TSource ElementAt<TSource>(this IEnumerable<TSource> source, int index);
TSource? ElementAtOrDefault<TSource>(this IEnumerable<TSource> source, Index index);
TSource? ElementAtOrDefault<TSource>(this IEnumerable<TSource> source, int index);
IEnumerable<TResult> Empty<TResult>();
IEnumerable<TSource> Except<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second);
IEnumerable<TSource> Except<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second, IEqualityComparer<TSource>? comparer);
IEnumerable<TSource> ExceptBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TKey> second, Func<TSource, TKey> keySelector);
IEnumerable<TSource> ExceptBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TKey> second, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer);
TSource First<TSource>(this IEnumerable<TSource> source);
TSource First<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
TSource? FirstOrDefault<TSource>(this IEnumerable<TSource> source);
TSource FirstOrDefault<TSource>(this IEnumerable<TSource> source, TSource defaultValue);
TSource? FirstOrDefault<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
TSource FirstOrDefault<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate, TSource defaultValue);
IEnumerable<TResult> GroupBy<TSource, TKey, TElement, TResult>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, Func<TKey, IEnumerable<TElement>, TResult> resultSelector, IEqualityComparer<TKey>? comparer);
IEnumerable<TResult> GroupBy<TSource, TKey, TElement, TResult>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, Func<TKey, IEnumerable<TElement>, TResult> resultSelector);
IEnumerable<TResult> GroupBy<TSource, TKey, TResult>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TKey, IEnumerable<TSource>, TResult> resultSelector, IEqualityComparer<TKey>? comparer);
IEnumerable<TResult> GroupBy<TSource, TKey, TResult>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TKey, IEnumerable<TSource>, TResult> resultSelector);
IEnumerable<IGrouping<TKey, TSource>> GroupBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector);
IEnumerable<IGrouping<TKey, TElement>> GroupBy<TSource, TKey, TElement>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector);
IEnumerable<IGrouping<TKey, TSource>> GroupBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer);
IEnumerable<IGrouping<TKey, TElement>> GroupBy<TSource, TKey, TElement>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, IEqualityComparer<TKey>? comparer);
IEnumerable<TResult> GroupJoin<TOuter, TInner, TKey, TResult>(this IEnumerable<TOuter> outer, IEnumerable<TInner> inner, Func<TOuter, TKey> outerKeySelector, Func<TInner, TKey> innerKeySelector, Func<TOuter, IEnumerable<TInner>, TResult> resultSelector, IEqualityComparer<TKey>? comparer);
IEnumerable<TResult> GroupJoin<TOuter, TInner, TKey, TResult>(this IEnumerable<TOuter> outer, IEnumerable<TInner> inner, Func<TOuter, TKey> outerKeySelector, Func<TInner, TKey> innerKeySelector, Func<TOuter, IEnumerable<TInner>, TResult> resultSelector);
IEnumerable<TSource> Intersect<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second, IEqualityComparer<TSource>? comparer);
IEnumerable<TSource> Intersect<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second);
IEnumerable<TSource> IntersectBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TKey> second, Func<TSource, TKey> keySelector);
IEnumerable<TSource> IntersectBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TKey> second, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer);
IEnumerable<TResult> Join<TOuter, TInner, TKey, TResult>(this IEnumerable<TOuter> outer, IEnumerable<TInner> inner, Func<TOuter, TKey> outerKeySelector, Func<TInner, TKey> innerKeySelector, Func<TOuter, TInner, TResult> resultSelector);
IEnumerable<TResult> Join<TOuter, TInner, TKey, TResult>(this IEnumerable<TOuter> outer, IEnumerable<TInner> inner, Func<TOuter, TKey> outerKeySelector, Func<TInner, TKey> innerKeySelector, Func<TOuter, TInner, TResult> resultSelector, IEqualityComparer<TKey>? comparer);
TSource Last<TSource>(this IEnumerable<TSource> source);
TSource Last<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
TSource? LastOrDefault<TSource>(this IEnumerable<TSource> source);
TSource LastOrDefault<TSource>(this IEnumerable<TSource> source, TSource defaultValue);
TSource? LastOrDefault<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
TSource LastOrDefault<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate, TSource defaultValue);
long LongCount<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
long LongCount<TSource>(this IEnumerable<TSource> source);
long Max<TSource>(this IEnumerable<TSource> source, Func<TSource, long> selector);
decimal Max<TSource>(this IEnumerable<TSource> source, Func<TSource, decimal> selector);
double Max<TSource>(this IEnumerable<TSource> source, Func<TSource, double> selector);
int Max<TSource>(this IEnumerable<TSource> source, Func<TSource, int> selector);
decimal? Max<TSource>(this IEnumerable<TSource> source, Func<TSource, decimal?> selector);
TSource? Max<TSource>(this IEnumerable<TSource> source, IComparer<TSource>? comparer);
int? Max<TSource>(this IEnumerable<TSource> source, Func<TSource, int?> selector);
long? Max<TSource>(this IEnumerable<TSource> source, Func<TSource, long?> selector);
float? Max<TSource>(this IEnumerable<TSource> source, Func<TSource, float?> selector);
TResult? Max<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, TResult> selector);
double? Max<TSource>(this IEnumerable<TSource> source, Func<TSource, double?> selector);
TSource? Max<TSource>(this IEnumerable<TSource> source);
float Max<TSource>(this IEnumerable<TSource> source, Func<TSource, float> selector);
float Max(this IEnumerable<float> source);
float? Max(this IEnumerable<float?> source);
long? Max(this IEnumerable<long?> source);
int? Max(this IEnumerable<int?> source);
double? Max(this IEnumerable<double?> source);
decimal? Max(this IEnumerable<decimal?> source);
long Max(this IEnumerable<long> source);
int Max(this IEnumerable<int> source);
double Max(this IEnumerable<double> source);
decimal Max(this IEnumerable<decimal> source);
TSource? MaxBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector);
TSource? MaxBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, IComparer<TKey>? comparer);
decimal Min(this IEnumerable<decimal> source);
TResult? Min<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, TResult> selector);
float Min<TSource>(this IEnumerable<TSource> source, Func<TSource, float> selector);
float? Min<TSource>(this IEnumerable<TSource> source, Func<TSource, float?> selector);
int? Min<TSource>(this IEnumerable<TSource> source, Func<TSource, int?> selector);
double? Min<TSource>(this IEnumerable<TSource> source, Func<TSource, double?> selector);
decimal? Min<TSource>(this IEnumerable<TSource> source, Func<TSource, decimal?> selector);
long Min<TSource>(this IEnumerable<TSource> source, Func<TSource, long> selector);
int Min<TSource>(this IEnumerable<TSource> source, Func<TSource, int> selector);
decimal Min<TSource>(this IEnumerable<TSource> source, Func<TSource, decimal> selector);
TSource? Min<TSource>(this IEnumerable<TSource> source, IComparer<TSource>? comparer);
TSource? Min<TSource>(this IEnumerable<TSource> source);
long? Min<TSource>(this IEnumerable<TSource> source, Func<TSource, long?> selector);
double Min<TSource>(this IEnumerable<TSource> source, Func<TSource, double> selector);
float Min(this IEnumerable<float> source);
float? Min(this IEnumerable<float?> source);
long? Min(this IEnumerable<long?> source);
int? Min(this IEnumerable<int?> source);
double? Min(this IEnumerable<double?> source);
decimal? Min(this IEnumerable<decimal?> source);
double Min(this IEnumerable<double> source);
long Min(this IEnumerable<long> source);
int Min(this IEnumerable<int> source);
TSource? MinBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, IComparer<TKey>? comparer);
TSource? MinBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector);
IEnumerable<TResult> OfType<TResult>(this IEnumerable source);
IOrderedEnumerable<TSource> OrderBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, IComparer<TKey>? comparer);
IOrderedEnumerable<TSource> OrderBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector);
IOrderedEnumerable<TSource> OrderByDescending<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector);
IOrderedEnumerable<TSource> OrderByDescending<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, IComparer<TKey>? comparer);
IEnumerable<TSource> Prepend<TSource>(this IEnumerable<TSource> source, TSource element);
IEnumerable<int> Range(int start, int count);
IEnumerable<TResult> Repeat<TResult>(TResult element, int count);
IEnumerable<TSource> Reverse<TSource>(this IEnumerable<TSource> source);
IEnumerable<TResult> Select<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, int, TResult> selector);
IEnumerable<TResult> Select<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, TResult> selector);
IEnumerable<TResult> SelectMany<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, int, IEnumerable<TResult>> selector);
IEnumerable<TResult> SelectMany<TSource, TCollection, TResult>(this IEnumerable<TSource> source, Func<TSource, IEnumerable<TCollection>> collectionSelector, Func<TSource, TCollection, TResult> resultSelector);
IEnumerable<TResult> SelectMany<TSource, TCollection, TResult>(this IEnumerable<TSource> source, Func<TSource, int, IEnumerable<TCollection>> collectionSelector, Func<TSource, TCollection, TResult> resultSelector);
IEnumerable<TResult> SelectMany<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, IEnumerable<TResult>> selector);
bool SequenceEqual<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second);
bool SequenceEqual<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second, IEqualityComparer<TSource>? comparer);
TSource Single<TSource>(this IEnumerable<TSource> source);
TSource Single<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
TSource SingleOrDefault<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate, TSource defaultValue);
TSource SingleOrDefault<TSource>(this IEnumerable<TSource> source, TSource defaultValue);
TSource? SingleOrDefault<TSource>(this IEnumerable<TSource> source);
TSource? SingleOrDefault<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
IEnumerable<TSource> Skip<TSource>(this IEnumerable<TSource> source, int count);
IEnumerable<TSource> SkipLast<TSource>(this IEnumerable<TSource> source, int count);
IEnumerable<TSource> SkipWhile<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
IEnumerable<TSource> SkipWhile<TSource>(this IEnumerable<TSource> source, Func<TSource, int, bool> predicate);
int Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, int> selector);
long Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, long> selector);
decimal? Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, decimal?> selector);
long? Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, long?> selector);
int? Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, int?> selector);
double Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, double> selector);
float? Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, float?> selector);
float Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, float> selector);
double? Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, double?> selector);
decimal Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, decimal> selector);
long? Sum(this IEnumerable<long?> source);
float? Sum(this IEnumerable<float?> source);
int? Sum(this IEnumerable<int?> source);
double? Sum(this IEnumerable<double?> source);
decimal? Sum(this IEnumerable<decimal?> source);
long Sum(this IEnumerable<long> source);
int Sum(this IEnumerable<int> source);
double Sum(this IEnumerable<double> source);
decimal Sum(this IEnumerable<decimal> source);
float Sum(this IEnumerable<float> source);
IEnumerable<TSource> Take<TSource>(this IEnumerable<TSource> source, Range range);
IEnumerable<TSource> Take<TSource>(this IEnumerable<TSource> source, int count);
IEnumerable<TSource> TakeLast<TSource>(this IEnumerable<TSource> source, int count);
IEnumerable<TSource> TakeWhile<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
IEnumerable<TSource> TakeWhile<TSource>(this IEnumerable<TSource> source, Func<TSource, int, bool> predicate);
IOrderedEnumerable<TSource> ThenBy<TSource, TKey>(this IOrderedEnumerable<TSource> source, Func<TSource, TKey> keySelector);
IOrderedEnumerable<TSource> ThenBy<TSource, TKey>(this IOrderedEnumerable<TSource> source, Func<TSource, TKey> keySelector, IComparer<TKey>? comparer);
IOrderedEnumerable<TSource> ThenByDescending<TSource, TKey>(this IOrderedEnumerable<TSource> source, Func<TSource, TKey> keySelector);
IOrderedEnumerable<TSource> ThenByDescending<TSource, TKey>(this IOrderedEnumerable<TSource> source, Func<TSource, TKey> keySelector, IComparer<TKey>? comparer);
TSource[] ToArray<TSource>(this IEnumerable<TSource> source);
Dictionary<TKey, TSource> ToDictionary<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector) where TKey : notnull;
Dictionary<TKey, TSource> ToDictionary<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer) where TKey : notnull;
Dictionary<TKey, TElement> ToDictionary<TSource, TKey, TElement>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector) where TKey : notnull;
Dictionary<TKey, TElement> ToDictionary<TSource, TKey, TElement>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, IEqualityComparer<TKey>? comparer) where TKey : notnull;
HashSet<TSource> ToHashSet<TSource>(this IEnumerable<TSource> source, IEqualityComparer<TSource>? comparer);
HashSet<TSource> ToHashSet<TSource>(this IEnumerable<TSource> source);
List<TSource> ToList<TSource>(this IEnumerable<TSource> source);
ILookup<TKey, TElement> ToLookup<TSource, TKey, TElement>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, IEqualityComparer<TKey>? comparer);
ILookup<TKey, TElement> ToLookup<TSource, TKey, TElement>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector);
ILookup<TKey, TSource> ToLookup<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector);
ILookup<TKey, TSource> ToLookup<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer);
bool TryGetNonEnumeratedCount<TSource>(this IEnumerable<TSource> source, out int count);
IEnumerable<TSource> Union<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second);
IEnumerable<TSource> Union<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second, IEqualityComparer<TSource>? comparer);
IEnumerable<TSource> UnionBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TSource> second, Func<TSource, TKey> keySelector);
IEnumerable<TSource> UnionBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TSource> second, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer);
IEnumerable<TSource> Where<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
IEnumerable<TSource> Where<TSource>(this IEnumerable<TSource> source, Func<TSource, int, bool> predicate);
IEnumerable<(TFirst First, TSecond Second, TThird Third)> Zip<TFirst, TSecond, TThird>(this IEnumerable<TFirst> first, IEnumerable<TSecond> second, IEnumerable<TThird> third);
IEnumerable<(TFirst First, TSecond Second)> Zip<TFirst, TSecond>(this IEnumerable<TFirst> first, IEnumerable<TSecond> second);
IEnumerable<TResult> Zip<TFirst, TSecond, TResult>(this IEnumerable<TFirst> first, IEnumerable<TSecond> second, Func<TFirst, TSecond, TResult> resultSelector);
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