Classify these objects based on their shape.
wheel, coin, CD, stamp, chess board
Round - wheel, coin, CD
Square - stamp, chess board
<START_INST>Classify these objects based on their shape.
wheel, coin, CD, stamp, chess board<END_INST><START_CTX><END_CTX><START_A>Round - wheel, coin, CD
Square - stamp, chess board<END_A>