Sundown were made by...
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Copyright (c) 2009, Natacha Porté
Copyright (c) 2011, Vicent Marti

php-sundown inspired Redcarpet2 which is a ruby extension for parsing and rendering Markdown text.
Vicent, Thanks for providing great libs and examples.

php-sundown were made by...
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Copyright (c) 2011-2012, Shuhei Tanuma