I have a file that has a list of words on each line, let's say:

dog monkey cat
cat ball stone
monkey iron cat zoo

What I need to do is find out which two-word combinations (order does not matter) on each line are most common in the file.

So I need to generate all pair combinations for each line and then figure out which pair combo is the most common over all the lines.

So, the first line should generate:

dog monkey
dog cat
monkey cat

I figured I should dump each line into an array and then generate the pair combos for each array. So, I started with tye's Finding all Combinations node:

http://www.perlmonks.org/?node_id=128293

But, alas, I'm stuck already as I'm not sure how to generate only _pair_ combinations rather than every possible combo.

Can anyone point me in the right direction? My spidey sense tells me I should use a hash. But not sure where to start...

Thanks much,

Zod