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<script src="//yihui.name/js/math-code.js"></script>
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<script async src="//cdn.bootcss.com/mathjax/2.7.1/MathJax.js?config=TeX-MML-AM_CHTML"></script>
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<script async src="//yihui.name/js/center-img.js"></script>
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{{ template "_internal/disqus.html" . }}
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