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## Subscript
Basic subscript is between `~`s:
```````````````````````````````` example
E=mc~2~.
.
<p>E=mc<sub>2</sub>.</p>
````````````````````````````````
Backslash escapes:
```````````````````````````````` example
E=mc\~2\~.
.
<p>E=mc~2~.</p>
````````````````````````````````
Spaces and formatting are allowed:
```````````````````````````````` example
E=mc~2 or *3*~.
.
<p>E=mc<sub>2 or <em>3</em></sub>.</p>
````````````````````````````````
Punctuation is ignored for purposes of determining
flankingness:
```````````````````````````````` example
E=mc~!~.
.
<p>E=mc<sub>!</sub>.</p>
````````````````````````````````
Subscript can't begin or end with a space:
```````````````````````````````` example
E=mc~ 2~.
E=mc~2 ~.
~ ~
.
<p>E=mc~ 2~.</p>
<p>E=mc~2 ~.</p>
<p>~ ~</p>
````````````````````````````````
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