A 'Group' is 3 cards that are either all the SAME on each card OR all DIFFERENT on in each
feature. That is to say, any feature in the 'Group' of three cards is either common to all
three cards or is different on each card.
The Features are:
Shape: Each card has ovals, squiggles, or diamonds on it.
Color: The shapes are red, green, or blue.
Number: Each card has one, two, or three shapes on it;
Shading: The shapes are solid, striped or outlined.
This game is a clone of Set, a card game invented my Marsha Falco.