shape
	round
		size
			small
				bowl
			large
				ball
	square
		size
			medium
				book
			large
				box
size
	small
		bowl
	medium
		book
	large
		shape
			round
				ball
			square
				box
		material
			plastic
				ball
			paper
				box
material
	plastic
		size
			small
				bowl
			large
				ball
	paper
		size
			medium
				book
			large
				box