POLYGON((0 0, 40 0, 40 40, 0 40, 0 0))
POLYGON((10 10 , 30 10, 30 30, 0 30, 10 10))
POLYGON((1 1, 2 1, 2 2, 1 2, 1 1))
POLYGON((11 11, 12 11, 12 12, 11 12, 11 11))