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Thanks GeneR.
Here's my solution
solution attached
Liked this one, and good timing! I recently had to solve a similar problem with matching pairs in my day job.
First I solved this in a convoluted way, then I figured out a simpler path. - terry10
terr
My solution could probably be a little simpler/more elegant, but it's short and works well.
I think it is a good challenge
first you have to create all combinations and hence remove those duplicates with different orders.