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Here's my solution along with one I made for my family exchange. The criteria for the family exchange is not to pick yourself, your spouse, and that it's a single loop (e.g. given people A, B, C, D, and E, you couldn't have the following assignments: 1) A has B has C has A and 2) D has E and E has D). I might update it so you also don't have the same person as you did the prior year.