Why we go to the line three times?

Hello,
I do not understand why we go down to 3 lines with this code.

#contributor : fabrice
#name : frac
# --
\$\frac{$1}{$2}\$ $0

======================
30 blabla frac then TAB
31 blabla
=====================

=====================
30 blabla \ frac () ()

34 blabla
====================
Thank you for your help.

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