use strict; use warnings; use Math::Combinatorics; use List::Util qw( first ); my @A = 'A' .. 'Z'; my @B = 0 .. 9; my $count = 0; my $comb_A = Math::Combinatorics->new( count => 3, data => [@A] ); while( my @combo_A = $comb_A->next_combination ) { my $comb_B = Math::Combinatorics->new( count => 2, data => [@B] ); INNER: while( my @combo_B = $comb_B->next_combination ) { my %overlap; @overlap{@combo_B} = (); next INNER if first{ exists $overlap{$_} } @combo_A; print join( ' ', @combo_A, @combo_B ), "\n"; $count++; } } print "Whew, that resulted in $count result-producing iterations!\n";