sometimes all you need is a slight variation to a common game to add a little excitement. they say right on the front they are for those 17 and under. into the areas within the shapes. like i said, it's "like" a learning game. but the same can’t be said in many other areas of a person’s life. 2 2 3 3 sin  a  b   , cos (a  b)  , 0 < a  b  90 , a > b a b 2 2 33. discharge any static electricity before installing by touching something metal. 