This is a binary grouping game, but it's a particularly difficult binary grouping game. I haven't seen one quite like this in terms of difficulty.
If you're wanting more work on binary grouping, you might try these games:
E 45, S 3, G 3
E 42, S 1, G 1
E 41, S 2, G 3
E 40, S 2, G 4
dan