+ * The python-markdown-extras package has support for [abbreviations](http://www.freewisdom.org/projects/python-markdown/Abbreviations), with the syntax that you just use the abbreviation in text (e.g. HTML) and then define the abbreviations at the end (like "footnote-style" links). For consistency, it might be good to use the same syntax, which apparently derives from [PHP-markdown-extra](http://michelf.com/projects/php-markdown/extra/#abbr).
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