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function f(x) { y = 1/0; return y }

aX = 1; bX = 13; aY = 1; bY = 10
Dx = 1/2; Dy = 1/2

Lx = [1,2.5,4,2.5,1]; Ly = [2,1,2,3,2]
C1="red"; L1x=[1,4,2.5,2.5,2.5]; L1y=[2,2,2,1,3]
L2x=[1*3,2.5*3,4*3,2.5*3,1*3]; L2y=[2*3,1*3,2*3,3*3,2*3]
C3="red"; L3x=[1*3,4*3,2.5*3,2.5*3,2.5*3]; L3y=[2*3,2*3,2*3,1*3,3*3]