What is a good algorithm to generate all the possible ordered combinations of the elements of an arbitrary number of arrays?

For example, given the following arrays: 

my @a = qw/A B C D E F/;
my @b = qw/1 2 3 4 5 6/;
my @c = qw/apple orange pomegranate grape/;
my @d = qw/wolf lion dog cat cow ape whale/;

[download]

how can I generate a list like this: 

[A, 1, apple, wolf]
[A, 1, apple, lion]
[A, 1, apple, dog]
...
[C, 5, pomegranate, ape]
[C, 5, pomegranate, whale]
[C, 5, grape, wolf]
[C, 5, grape, lion]
...
[F, 6, grape, whale]

[download]

if I don't know how many such arrays I will have to start with?

In reply to generating combinations of elements of an arbitrary number of arrays by mickey

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