Tests
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Now tex on the following line, valid fot tex (with @end tex on a line).

Same that @html (but empty following line not ignored).

Test of @math Here some x^i\over\tan y.

Maths with protected \: a \ b.

Maths with code @-command:

math code a < b

Maths with code @-command and braces:

 \underlinemath \hbox code  \sum_i\underlinef

@\ outside of math

\