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  1. or download this
    #https://perlmonks.org/?node_id=11124854

...
my @input = (qw/a b c d/);

permutation('',@input);
  2. or download this
    C:/Perl_524/bin\perl.exe -w d:/tmp/pm/permute.pl 
 1:
...
dcba

Compilation finished at Tue Dec  8 22:44:20