my $you_and_mees = seq( "you", "me" ); seq_prod( $abcees, $one_two_threes, $you_and_mees ) ->enumerate; # 0 => a 1 you # 1 => a 1 me # 2 => a 2 you # 3 => a 2 me # 4 => a 3 you # 5 => a 3 me # 6 => b 1 you # 7 => b 1 me # 8 => b 2 you # 9 => b 2 me # 10 => b 3 you # 11 => b 3 me # 12 => c 1 you # 13 => c 1 me # 14 => c 2 you # 15 => c 2 me # 16 => c 3 you # 17 => c 3 me