This game struck me as an interesting type. I suppose it's an open assignment - no repeats game, but while at first it doesn't seem so remarkable, after taking a deeper look the very nature of the game is quite different from others I've faced.
That's because we don't know how many groupings we are going to create. We learn rules restricting what various size groups each variable can go into (A can only go in a 2 or 3 variable group, etc.), and that all 7 variables will be placed into groups. From that information we have to consider the different possible numerical distributions, and from there figure out who could go where.
Is this game sort of a pure numerical distribution game? Are there other games like this where we don't know how many groups we'll be making?