https://docs.emmet.io/abbreviations/syntax/#sibling
https://docs.emmet.io/abbreviations/syntax/#grouping
ul>(li+br)*12
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https://docs.emmet.io/cheat-sheet/
http://bit.ly/2mLmFAn
https://docs.emmet.io/cheatsheet-a5.pdf
http://www.creativewebdesign.ro/sitecwd/uploads/2013/06/Emmet-Cheat-Sheet.pdf