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in reply to Multiple Combinatorics

My List::MapMulti module may help.

An example:

use 5.010;
use List::MapMulti qw/iterator_multi/;

my @letters = 'a' .. 'z';
my @numbers = 0 .. 9;

my $iter = iterator_multi \@letters, \@letters, \@letters, \@numbers, 
+\@numbers;

# This loops through every possible combination
# of those lists.
#
while ( my @row = $iter->() ) {
  say join q(-), @row;
}

[download]
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

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