A = (5, 2)
B = (13, 2)
C = (13, 5)
poly1, c, a, b = Polygon(A, B, C)
D = (13, 0)
I = (13, 2)
J = (10, 2)
G = (10, 1)
H = (8, 1)
F = (5, 0)
E = (5, 2)
B' = (8, 0)
poly2, b', d, i, j, g, h = Polygon(B', D, I, J, G, H)
H' = (5, 0)
G' = (7, 0)
J' = (7, 1)
I' = (10, 1)
F' = (10, 2)
C' = (5, 2)
poly3, h', g', j', i', f', c' = Polygon(H', G', J', I', F', C')
C'' = (0, 0)
poly4, e, c'', f = Polygon(C'', F, E)