#2 and #3 instead? - `lset<=` - `lset=` - `lset-adjoin` - `lset-union` - `lset-intersection` - `lset-difference` - `lset-xor` - `lset-diff+intersection` - `lset-union!` - `lset-intersection!` - `lset-difference!` - `lset-xor!` - `lset-diff+intersection!`
