(A∩B∩C)'=A'∪B'∪C'

A

B

×

×

C

×

O: (0.5 * (Corner[1] + Corner[3])) + (0, 1)
a = true
b = true
A_3: O + (0.4, 0.8)
A_2: O + ((-0.4), 0.8)
A_1: O + ((-7.8), 0.8)
A_4: O + (7.8, 0.8)
A_6: O + ((-7.8), (-3.4))
A_5: O + (7.8, (-3.4))
a_1 = Segment(A_1, A_2)
a_2 = Segment(A_4, A_3)
a_3 = Segment(A_4, A_5)
a_0 = Segment(A_1, A_6)
a_4 = Segment(A_5, A_6)
c = true