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Formatting italic bold bold italic what the four stars five stars And *hello world and so on etc etc etc* – goes wrong.
Now hello world and so on. How about hello world etc? So count the number of stars at each end. If odd, italics; if even positive then bold, else normal.
MathJax example. BlockQuotes MarkdownTables MarkdownFootnotes
hello world
ABC Music Notation
See abcjs.net for info on how to write music in ABC. 04a9fe5cd3c7088b2c97e1a5c6aaa703375be092c7451bc7d6a077377a4cfcb12c624232cdd221771294dfbb310aca000a0df6ac8b66b696d90ef06fdefb64a3

[[youtube:WaX54yLE5dc]] random_word hello Hello **bold
paras**
bold
paras