#!/usr/bin/perl -l
# https://en.wikipedia.org/wiki/Permutation#Generation_in_lexicographi
+c_order
use strict;
use warnings;
$_ = 'aabbcc';
1 while print,
s/.*\K # find the last
(.) # char such that
(.*) # there is a later (latest)
(.)(??{$1 ge $3 and '(*F)'}) # char greater than it
(.*) # and get rest
# swap those two chars ( $1 & $3 )
# then reverse everything after the first swapped char
/ $3 . reverse $2.$1.$4 /xe
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