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<!DOCTYPE html>
<html lang="en">
<!-- Head tag (contains Google-Analytics、Baidu-Tongji)-->
<head>
<!-- Google Analytics -->
<!-- Global site tag (gtag.js) - Google Analytics -->
<script async="async" src="https://www.googletagmanager.com/gtag/js?id=UA-xxxxxx-xx"></script>
<script type="text/javascript">
window.dataLayer = window.dataLayer || [];
function gtag() {
dataLayer.push(arguments);
}
gtag('js', new Date());
gtag('config', 'UA-xxxxxx-xx');
</script>
<!-- Baidu Tongji -->
<script type="text/javascript">
// Originial
var _hmt = _hmt || [];
(function () {
var hm = document.createElement("script");
hm.src = "https://hm.baidu.com/hm.js?xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(hm, s);
})();
</script>
<!-- Baidu Push -->
<script>
(function () {
var bp = document.createElement('script');
var curProtocol = window.location.protocol.split(':')[0];
if (curProtocol === 'https') {
bp.src = 'https://zz.bdstatic.com/linksubmit/push.js';
} else {
bp.src = 'http://push.zhanzhang.baidu.com/push.js';
}
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(bp, s);
})();
</script>
<meta charset="utf-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
<meta name="google-site-verification" content="lxDfCplOZbIzjhG34NuQBgu2gdyRlAtMB4utP5AgEBc"/>
<meta name="baidu-site-verification" content="PpzM9WxOJU"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<meta name="description" content="It's an IT blog..."/>
<meta name="keyword" content="network,machine learning, code"/>
<link rel="shortcut icon" href="/img/avatar/github-icon.png"/>
<!-- Place this tag in your head or just before your close body tag. -->
<script async="async" defer="defer" src="https://buttons.github.io/buttons.js"></script>
<!-- Bootstrap Core CSS -->
<link rel="stylesheet" href="/css/bootstrap.min.css"/>
<!-- Custom CSS -->
<link rel="stylesheet" href="/css/beantech.min.css"/>
<!-- Pygments Highlight CSS -->
<link rel="stylesheet" href="/css/highlight.css"/>
<link rel="stylesheet" href="/css/widget.css"/>
<link rel="stylesheet" href="/css/rocket.css"/>
<link rel="stylesheet" href="/css/signature.css"/>
<link rel="stylesheet" href="/css/catalog.css"/>
<link rel="stylesheet" href="/css/livemylife.css"/>
<!-- wave start -->
<link rel="stylesheet" href="/css/wave.css"/>
<!-- wave end -->
<!-- ThemeColor start -->
<link rel="stylesheet" href="/css/scroll.css"/>
<!-- ThemeColor end -->
<!-- viewer start (Picture preview) -->
<link rel="stylesheet" href="/css/viewer.min.css"/>
<!-- viewer end -->
<!-- Search start -->
<link rel="stylesheet" href="/css/search.css"/>
<!-- Search end -->
<!-- Custom Fonts -->
<!-- <link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css" rel="stylesheet" type="text/css"> -->
<!-- Hux change font-awesome CDN to qiniu -->
<link rel="stylesheet" href="https://cdn.staticfile.org/font-awesome/4.5.0/css/font-awesome.min.css" type="text/css">
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<!-- Hux Delete, sad but pending in China <link href='http://fonts.googleapis.com/css?family=Lora:400,700,400italic,700italic' rel='stylesheet' type='text/css'> <link
href='http://fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800' rel='stylesheet' type='text/ css'> -->
<!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]> <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script> <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script> <![endif]-->
<!-- ga & ba script hoook -->
<link rel="canonical" href="http://yoursite-url/404.html">
<title>
fhgreenery.github.io
</title>
<meta name="generator" content="Hexo 5.4.0"></head>
<!-- hack iOS CSS :active style -->
<body ontouchstart="" class="body--light">
<!-- ThemeColor -->
<!-- Gitter -->
<!-- Navigation (contains search)-->
<!-- Navigation -->
<nav class="navbar navbar-default navbar-custom navbar-fixed-top">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header page-scroll">
<button type="button" class="navbar-toggle">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="/">Feng's blog</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<!-- Known Issue, found by Hux: <nav>'s height woule be hold on by its content. so, when navbar scale out, the <nav> will cover tags. also mask any touch event of tags, unfortunately. -->
<div id="huxblog_navbar">
<div class="navbar-collapse">
<ul class="nav navbar-nav navbar-right">
<li>
<a href="/">HOME</a>
</li>
<li>
<a href="/archive/">
ARCHIVES
</a>
</li>
<li>
<a href="/about/">
</a>
</li>
<li>
<a href="/tags/">
TAGS
</a>
</li>
<li>
<a href="/categories/">
CATEGORIES
</a>
</li>
<li>
<a class="popup-trigger">
<span class="search-icon"></span>SEARCH</a>
</li>
<!-- LangSelect -->
</ul>
</div>
</div>
<!-- /.navbar-collapse -->
</div>
<!-- /.container -->
</nav>
<!-- progress -->
<div id="progress">
<div class="line" style="width: 0%;"></div>
</div>
<script>
// Drop Bootstarp low-performance Navbar Use customize navbar with high-quality material design animation in high-perf jank-free CSS3 implementation
var $body = document.body;
var $toggle = document.querySelector('.navbar-toggle');
var $navbar = document.querySelector('#huxblog_navbar');
var $collapse = document.querySelector('.navbar-collapse');
$toggle.addEventListener('click', handleMagic)
function handleMagic(e) {
if ($navbar.className.indexOf('in') > 0) {
// CLOSE
$navbar.className = " ";
// wait until animation end.
setTimeout(function() {
// prevent frequently toggle
if ($navbar.className.indexOf('in') < 0) {
$collapse.style.height = "0px"
}
}, 400)
} else {
// OPEN
$collapse.style.height = "auto"
$navbar.className += " in";
}
}
</script>
<!-- Post Header (contains intro-header、signature、wordcount、busuanzi、waveoverlay) -->
<!-- Modified by Yu-Hsuan Yen -->
<!-- Post Header -->
<style type="text/css">
.body--light {
/* intro-header */
--intro-header-background-image-url-home: url('/img/header_img/newhome_bg.jpg');
--intro-header-background-image-url-post: url('img/header_img/404_bg.jpg');
--intro-header-background-image-url-page: url('/img/header_img/404_bg.jpg');
}
.body--dark {
--intro-header-background-image-url-home: linear-gradient(rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.2)), url('/img/header_img/newhome_bg.jpg');
--intro-header-background-image-url-post: linear-gradient(rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.2)), url('img/header_img/404_bg.jpg');
--intro-header-background-image-url-page: linear-gradient(rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.2)), url('/img/header_img/404_bg.jpg');
}
header.intro-header {
/*page*/
background-image: var(--intro-header-background-image-url-page);
/* background-image: url('/img/header_img/404_bg.jpg'); */
}
</style>
<!-- Main Content (Post contains
Pager、
tip、
socialshare、
gitalk、gitment、disqus-comment、
Catalog、
Sidebar、
Featured-Tags、
Friends Blog、
anchorjs、
) -->
<style type="text/css">
.body--light {
/* intro-header */
--intro-header-background-image-url-404: url('/img/header_img/404_bg.jpg');
}
.body--dark {
--intro-header-background-image-url-404: linear-gradient(rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.2)), url('/img/header_img/404_bg.jpg');
}
header.intro-header {
background-image: var(--intro-header-background-image-url-404);
}
</style>
<!-- Page Header -->
<header class="intro-header">
<div class="container">
<div class="row">
<div class="col-lg-8 col-lg-offset-2 col-md-10 col-md-offset-1 ">
<div class="site-heading">
<h1>404</h1>
<!--<hr class="small">-->
<span class="subheading">I'm sorry there is nothing that you want , but you can enjoy the scenery here ...</span>
</div>
</div>
</div>
</div>
</header>
<script>
document.body.classList.add('page-fullscreen');
</script>
<!-- Footer (contains ThemeColor、viewer) -->
<!-- Footer -->
<footer>
<div class="container">
<div class="row">
<div class="col-lg-8 col-lg-offset-2 col-md-10 col-md-offset-1">
<ul class="list-inline text-center">
<li>
<a target="_blank" href="https://github.com/fhgreenery">
<span class="fa-stack fa-lg">
<i class="fa fa-circle fa-stack-2x"></i>
<i class="fa fa-github fa-stack-1x fa-inverse"></i>
</span>
</a>
</li>
<li>
<a target="_blank" href="https://twitter.com/yourAccount">
<span class="fa-stack fa-lg">
<i class="fa fa-circle fa-stack-2x"></i>
<i class="fa fa-twitter fa-stack-1x fa-inverse"></i>
</span>
</a>
</li>
<li>
<a target="_blank" href="https://www.facebook.com/yourAccount">
<span class="fa-stack fa-lg">
<i class="fa fa-circle fa-stack-2x"></i>
<i class="fa fa-facebook fa-stack-1x fa-inverse"></i>
</span>
</a>
</li>
<li>
<a target="_blank" href="http://weibo.com/yourAccount">
<span class="fa-stack fa-lg">
<i class="fa fa-circle fa-stack-2x"></i>
<i class="fa fa-weibo fa-stack-1x fa-inverse"></i>
</span>
</a>
</li>
</ul>
<p class="copyright text-muted">
Copyright ©
Feng
2022
<br>
Theme by
<a target="_blank" rel="noopener" href="https://v-vincen.life">Live My Life </a>
<span style="display: inline-block; margin: 0 5px;">
<i class="fa fa-heart"></i>
</span>
re-Ported by
<a target="_blank" rel="noopener" href="https://fhgreenery.github.io/">Feng</a>
<!--<iframe style="margin-left: 2px; margin-bottom:-5px;" frameborder="0" scrolling="0" width="91px" height="20px" src="https://ghbtns.com/github-btn.html?user=fhgreenery&repo=fhgreenery.github.io&type=star&count=true"></iframe>
-->
</p>
</div>
</div>
</div>
</footer>
<a id="rocket" href="#top" class=""></a>
<!-- jQuery -->
<script type="text/javascript" src="/js/jquery.min.js"></script>
<!-- Bootstrap Core JavaScript -->
<script type="text/javascript" src="/js/bootstrap.min.js"></script>
<!-- Custom Theme JavaScript -->
<script type="text/javascript" src="/js/hux-blog.min.js"></script>
<!-- catalog -->
<script async="true" type="text/javascript" src="/js/catalog.js"></script>
<!-- totop(rocket) -->
<script async="true" type="text/javascript" src="/js/totop.js"></script>
<!-- Scroll start -->
<script async="async" type="text/javascript" src="/js/scroll.js"></script>
<!-- Scroll end -->
<!-- LangSelect start -->
<script type="text/javascript" src="/js/langselect.js"></script>
<!-- LangSelect end -->
<!-- ribbon -->
<script type="text/javascript" src="/js/ribbonDynamic.js"></script>
<!-- viewer start -->
<!-- viewer start (Picture preview) -->
<script async="async" type="text/javascript" src="/js/viewer/viewer.min.js"></script>
<script async="async" type="text/javascript" src="/js/viewer/pic-viewer.js"></script>
<!-- viewer end -->
<script>
// async load function
function async (u, c) {
var d = document,
t = 'script',
o = d.createElement(t),
s = d.getElementsByTagName(t)[0];
o.src = u;
if (c) {
o.addEventListener('load', function (e) {
c(null, e);
}, false);
}
s.parentNode.insertBefore(o, s);
}
// fastClick.js
async ("https://cdn.bootcss.com/fastclick/1.0.6/fastclick.min.js", function () {
var $nav = document.querySelector("nav");
if ($nav)
FastClick.attach($nav);
}
)
</script>
<!-- Because of the native support for backtick-style fenced code blocks right within the Markdown is landed in Github Pages, From V1.6, There is no need for Highlight.js, so Huxblog drops it officially. -
https://github.com/blog/2100-github-pages-now-faster-and-simpler-with-jekyll-3-0 - https://help.github.com/articles/creating-and-highlighting-code-blocks/ -->
<!-- <script> async ("http://cdn.bootcss.com/highlight.js/8.6/highlight.min.js", function () { hljs.initHighlightingOnLoad(); }) </script> <link href="http://cdn.bootcss.com/highlight.js/8.6/styles/github.min.css" rel="stylesheet"> -->
<!-- jquery.tagcloud.js -->
<!-- <script> // only load tagcloud.js in tag.html if ($('#tag_cloud').length !== 0) { async ("http://yoursite-url/js/jquery.tagcloud.js", function () { $.fn.tagcloud.defaults = { // size: { start: 1, end: 1, unit: 'em' }, color: {
start: '#bbbbee', end: '#0085a1' } }; $('#tag_cloud a').tagcloud(); }) } </script> -->
<!-- Search -->
<div class="popup search-popup local-search-popup">
<span class="popup-btn-close">
ESC
</span>
<div class="container">
<div class="row">
<!-- <div class="col-md-9 col-md-offset-1"> -->
<div class="col-lg-9 col-lg-offset-1 col-md-10 col-md-offset-1 local-search-content">
<div class="local-search-header clearfix">
<div class="local-search-input-wrapper">
<span class="search-icon">
<i class="fa fa-search fa-lg" style="margin: 25px 10px 25px 20px;"></i>
</span>
<input autocomplete="off" placeholder="SEARCH..." type="text" id="local-search-input">
</div>
</div>
<div id="local-search-result"></div>
</div>
</div>
</div>
</div>
<script src="/js/ziploader.js"></script>
<script>
// Popup Window;
var isfetched = false;
var isXml = true;
// Search DB path;
var search_path = "search.json";
if (search_path.length === 0) {
search_path = "search.xml";
} else if (/json$/i.test(search_path)) {
isXml = false;
}
// monitor main search box;
var onPopupClose = function (e) {
$('.popup').fadeOut(300);
$('#local-search-input').val('');
$('.search-result-list').remove();
$('#no-result').remove();
$('body').css('overflow', '');
}
function proceedsearch() {
$('.popup').fadeIn(300);
var $localSearchInput = $('#local-search-input');
$localSearchInput.attr("autocapitalize", "none");
$localSearchInput.attr("autocorrect", "off");
$localSearchInput.focus();
}
// get search zip version
$.get('/searchVersion.json?t=' + (+new Date()), function (res) {
if (localStorage.getItem('searchVersion') !== res) {
localStorage.setItem('searchVersion', res);
initSearchJson();
}
});
function initSearchJson() {
initLoad(['/search.flv'], {
loadOptions: {
success: function (obj) {
localStorage.setItem('searchJson', obj['search.json'])
},
error: function (e) {
return console.log(e)
}
},
returnOptions: {
'json': TYPE_TEXT
},
mimeOptions: {
'json': 'application/json'
}
})
}
// search function;
var searchFunc = function (search_id, content_id) {
'use strict';
isfetched = true;
var datas = JSON.parse(localStorage.getItem('searchJson'));
// console.log(search_id)
var input = document.getElementById(search_id);
var resultContent = document.getElementById(content_id);
var inputEventFunction = function () {
var searchText = input.value.trim().toLowerCase();
var keywords = searchText.split(/[\s\-]+/);
if (keywords.length > 1) {
keywords.push(searchText);
}
var resultItems = [];
if (searchText.length > 0) {
// perform local searching
datas.forEach(function (data) {
var isMatch = false;
var hitCount = 0;
var searchTextCount = 0;
var title = data.title
? data.title.trim()
: '';
var titleInLowerCase = title.toLowerCase();
var content = data.content
? data.content.trim().replace(/<[^>]+>/g, "")
: '';
var contentInLowerCase = content.toLowerCase();
var articleUrl = decodeURIComponent(data.url);
var date = data.date;
var dateTime = date.replace(/T/, " ").replace(/.000Z/, "");
var imgUrl = data.header_img;
var indexOfTitle = [];
var indexOfContent = [];
// only match articles with not empty titles
keywords.forEach(function (keyword) {
function getIndexByWord(word, text, caseSensitive) {
var wordLen = word.length;
if (wordLen === 0) {
return [];
}
var startPosition = 0,
position = [],
index = [];
if (!caseSensitive) {
text = text.toLowerCase();
word = word.toLowerCase();
}
while ((position = text.indexOf(word, startPosition)) > -1) {
index.push({position: position, word: word});
startPosition = position + wordLen;
}
return index;
}
indexOfTitle = indexOfTitle.concat(getIndexByWord(keyword, titleInLowerCase, false));
indexOfContent = indexOfContent.concat(getIndexByWord(keyword, contentInLowerCase, false));
});
if (indexOfTitle.length > 0 || indexOfContent.length > 0) {
isMatch = true;
hitCount = indexOfTitle.length + indexOfContent.length;
}
// show search results
if (isMatch) {
// sort index by position of keyword
[indexOfTitle, indexOfContent].forEach(function (index) {
index.sort(function (itemLeft, itemRight) {
if (itemRight.position !== itemLeft.position) {
return itemRight.position - itemLeft.position;
} else {
return itemLeft.word.length - itemRight.word.length;
}
});
});
// merge hits into slices
function mergeIntoSlice(text, start, end, index) {
var item = index[index.length - 1];
var position = item.position;
var word = item.word;
var hits = [];
var searchTextCountInSlice = 0;
while (position + word.length <= end && index.length != 0) {
if (word === searchText) {
searchTextCountInSlice++;
}
hits.push({position: position, length: word.length});
var wordEnd = position + word.length;
// move to next position of hit
index.pop();
while (index.length != 0) {
item = index[index.length - 1];
position = item.position;
word = item.word;
if (wordEnd > position) {
index.pop();
} else {
break;
}
}
}
searchTextCount += searchTextCountInSlice;
return {hits: hits, start: start, end: end, searchTextCount: searchTextCountInSlice};
}
var slicesOfTitle = [];
if (indexOfTitle.length != 0) {
slicesOfTitle.push(mergeIntoSlice(title, 0, title.length, indexOfTitle));
}
var slicesOfContent = [];
while (indexOfContent.length != 0) {
var item = indexOfContent[indexOfContent.length - 1];
var position = item.position;
var word = item.word;
// cut out 100 characters
var start = position - 20;
var end = position + 80;
if (start < 0) {
start = 0;
}
if (end < position + word.length) {
end = position + word.length;
}
if (end > content.length) {
end = content.length;
}
slicesOfContent.push(mergeIntoSlice(content, start, end, indexOfContent));
}
// sort slices in content by search text's count and hits' count
slicesOfContent.sort(function (sliceLeft, sliceRight) {
if (sliceLeft.searchTextCount !== sliceRight.searchTextCount) {
return sliceRight.searchTextCount - sliceLeft.searchTextCount;
} else if (sliceLeft.hits.length !== sliceRight.hits.length) {
return sliceRight.hits.length - sliceLeft.hits.length;
} else {
return sliceLeft.start - sliceRight.start;
}
});
// select top N slices in content
var upperBound = parseInt('1');
if (upperBound >= 0) {
slicesOfContent = slicesOfContent.slice(0, upperBound);
}
// highlight title and content
function highlightKeyword(text, slice) {
var result = '';
var prevEnd = slice.start;
slice.hits.forEach(function (hit) {
result += text.substring(prevEnd, hit.position);
var end = hit.position + hit.length;
result += '<b class="search-keyword">' + text.substring(hit.position, end) + '</b>';
prevEnd = end;
});
result += text.substring(prevEnd, slice.end);
return result;
}
var resultItem = '';
// if (slicesOfTitle.length != 0) { resultItem += "<li><a target='_blank' href='" + articleUrl + "' class='search-result-title'>" + highlightKeyword(title, slicesOfTitle[0]) + "</a>"; } else { resultItem += "<li><a target='_blank' href='" +
// articleUrl + "' class='search-result-title'>" + title + "</a>"; } slicesOfContent.forEach(function (slice) { resultItem += "<a target='_blank' href='" + articleUrl + "'><p class=\"search-result\">" + highlightKeyword(content, slice) +
// "...</p></a>"; }); resultItem += "</li>";
if (slicesOfTitle.length != 0) {
resultItem += "<a target='_blank' href='" + articleUrl + "' class='search-result'><div class='search-result-left'><div class='search-result-title'>" + highlightKeyword(title, slicesOfTitle[0]) + "</div><time class='search-result-date'>" + dateTime + "</time>";
} else {
resultItem += "<a target='_blank' href='" + articleUrl + "' class='search-result'><div class='search-result-left'><div class='search-result-title'>" + title + "</div><time class='search-result-date'>" + dateTime + "</time>";
}
slicesOfContent.forEach(function (slice) {
resultItem += "<p class=\"search-result-content\">" + highlightKeyword(content, slice) + "...</p>";
});
resultItem += "</div><div class='search-result-right'><img class='media-image' src='" + imgUrl + "' width='64px' height='48px'></img></div></a>";
resultItems.push({item: resultItem, searchTextCount: searchTextCount, hitCount: hitCount, id: resultItems.length});
}
})
};
if (keywords.length === 1 && keywords[0] === "") {
resultContent.innerHTML = '<div id="no-result"></div>'
} else if (resultItems.length === 0) {
resultContent.innerHTML = '<div id="no-result"></div>'
} else {
resultItems.sort(function (resultLeft, resultRight) {
if (resultLeft.searchTextCount !== resultRight.searchTextCount) {
return resultRight.searchTextCount - resultLeft.searchTextCount;
} else if (resultLeft.hitCount !== resultRight.hitCount) {
return resultRight.hitCount - resultLeft.hitCount;
} else {
return resultRight.id - resultLeft.id;
}
});
var searchResultList = '<div class=\"search-result-list\">';
resultItems.forEach(function (result) {
searchResultList += result.item;
})
searchResultList += "</div>";
resultContent.innerHTML = searchResultList;
}
}
if ('auto' === 'auto') {
input.addEventListener('input', inputEventFunction);
} else {
$('.search-icon').click(inputEventFunction);
input.addEventListener('keypress', function (event) {
if (event.keyCode === 13) {
inputEventFunction();
}
});
}
// remove loading animation
$('body').css('overflow', '');
proceedsearch();
}
// handle and trigger popup window;
$('.popup-trigger').click(function (e) {
e.stopPropagation();
if (isfetched === false) {
searchFunc('local-search-input', 'local-search-result');
} else {
proceedsearch();
};
});
$('.popup-btn-close').click(onPopupClose);
$('.popup').click(function (e) {
e.stopPropagation();
});
$(document).on('keyup', function (event) {
var shouldDismissSearchPopup = event.which === 27 && $('.search-popup').is(':visible');
if (shouldDismissSearchPopup) {
onPopupClose();
}
});
document.addEventListener('mouseup', (e) => {
var _con = document.querySelector(".local-search-content");
if (_con) {
if (!_con.contains(e.target)) {
onPopupClose();
}
}
});
</script>
<script type="text/x-mathjax-config">
MathJax.Hub.Config({
tex2jax: {
inlineMath: [ ["$","$"], ["\\(","\\)"] ],
skipTags: ['script', 'noscript', 'style', 'textarea', 'pre', 'code'],
processEscapes: true
}
});
MathJax.Hub.Queue(function() {
var all = MathJax.Hub.getAllJax();
for (var i = 0; i < all.length; ++i)
all[i].SourceElement().parentNode.className += ' has-jax';
});
</script>
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