Composition Calculus by hinoe

A:$<
(.)(.+?)\n(.*):$1,$2"\n"$3
(.+),( .)(.*):$(($1$2)),$3
(.+),:$1
\({3}\. ([^()]|\((?1)+\)). ((?1)). (.+).:($1\ $(($2\ $3)))
.*:"$&"

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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