If memory use is your only concern, then here's a rehash (har har har) of one of my prior atrocities...
| | $_ = 'acgnt' x 4;
push @strings, "$1$2" while /.*(.).*(.)(?(?{$_{"$1$2"}++})^)/;
push @strings, "$1$2$3" while /.*(.).*(.).*(.)(?(?{$_{"$1$2$3"}++})^
+)/;
push @strings, "$1$2$3$4" while /.*(.).*(.).*(.).*(.)(?(?{$_{"$1$2$3$4
+"}++})^)/;
print join $/, @strings;
|
MeowChow
s aamecha.s a..a\u$&owag.print
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