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Diff Match and Patch
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.icu/scripts/9547/48896/diff_match_patch-for-require.js
Copied from http://kccode.googlecode.com/svn/trunk/source/javascript/diff/source/js/diff_match_patch_uncompressed.js for @require integration.