Prüfe!

A = (0, 3)
B = (2, 3)
a = Segment(A, B)
C = (3, 5)
b = Segment(B, C)
D = (4, 3)
c = Segment(C, D)
E = (6, 3)
d = Segment(D, E)
F = (4, 1)
e = Segment(E, F)
G = (6, -1)
f = Segment(F, G)
H = (4, -1)
g = Segment(G, H)
I = (3, -3)
h = Segment(H, I)
J = (3, -3)
K = (2, -1)
i = Segment(J, K)
L = Point(i)
M = (0, -1)
j = Segment(M, L)
N = (2, 1)
k = Segment(M, N)
l = Segment(N, A)
m = Line(C, J)
n = Line(N, F)
o = false
O = (-3, 0)
P = (-3, -3)
p = Segment(O, P)
Q = (-2, 3)
R = (-2, -1)
q = Segment(Q, R)