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Take the first element of @left, combine it with all elements of @righ
+t
Take the second element of @left, combine it with all elements of reve
+rse @right
Take the third element of @left, combine it with all elements of @righ
+t
...

use v5.20;
use strict;
use warnings;
...

pp combine ['A' .. 'F'], combine ['a'..'d'], [1..8];
pp combine [1..3], combine [1..4], [1..3];