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sub c {my(@a,%h,$i)=split//,pop;my$s=pop;$s=~s!(.)!$h{$1}||=$a[$i++]!g +e;$s}
sub c {my($a,%h,$i)=pop;my$s=pop;$s=~s!(.)!$h{$1}||=substr$a,$i++,1!ge +;$s}
sub c {($s,$a)=@_;my(%h,$i);$s=~s!(.)!$h{$1}||=substr$a,$i++,1!ge;$s}
sub c {($s,$a)=@_;$s=~s!(.)!$h{$1}||=substr$a,$i++,1!ge;$s}
sub c {($_,$a)=@_;s!(.)!$h{$1}||=substr$a,$i++,1!ge;$_}
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