Code Festival A If you cannot solve this by mitchs (%20)

s/00/90/g
s/.\B/&&&&&&&&&&/g
:
s/[2-9]/&1/g
y/23456789/12345678/
t
s/ //3
s/1. \(1*\)/1 \10\1\100/
t
s/0//g
/ \(1*\) \1/cFail
cPass

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

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