I disagree on #3's minimum score, as seen by my comments in my answer:
# 3 -- 23 chars
# note: using $ instead of \z is *wrong*
# note: using . without /s is *wrong*
sub g3 { pop=~/^(.*?)\1+\z/s&&$1 }
For that matter, par is 22:
sub g3 { pop=~/^(.*?)\1+\z/s;$1 }
japhy --
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