I have a 2D array storing the possible words at each position in a string. So, for example:

the
cat dog
sat lay
on
the
mat

(The first word must be `the', the second can be `cat' or `dog', etc).

I know there are 4 possible combinations but what is the most efficient way to extract these combinations from the 2D array in Perl?

Thanks

In reply to Combinatorial Algorithms by Anonymous Monk

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