Good, but it could use a tutorial, teaching 3 x 3 x 2 x 2 x 2 = 72. How many 2's or 3's you have in your selection would be a useful tooltip. Something like {9, 9, 2, 2} => "4 [3] 2 [2]." When you have 9,9,2,2 selected, the tooltip shows that you have 4 3's and 2 2's.