For Loop by brx(booh)

$a.="$.for v$_ = 0 to 9
",$\="$.next
".$\,$..='  ',$b.="v$_,"for 1..10;chop$b;print$a=~s/0/1/r,"$.print $b
"

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

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