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sub japhy {  # 74
our$P="";pop=~m{(.+).?(??{reverse$1})
(?{length$P<length$&and$P=$&})^}xs;$P
}

sub japhy {  # 68
our@P="";pop=~m{(.+).?(??{reverse$
1})(?{$P[length$&]=$&})^}xs;$P[-1]
}