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HELP

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

aX = -10; bX = 10; aY = -10; bY = 10
Dx = 2.5; Dy = 2.5

L1x=[0,-2.5,-7,-2.5,0,2.5,7,2.5,0]
L1y=[7,2.5,0,-2.5,-7,-2.5,0,2.5,7]
Px=[-2.5,0,2.5,0]; Py=[2.5,2.5,2.5,7]
L2x=[-2.5,0,0,0,2.5]; L2y=[2.5,2.5,7,2.5,2.5]
Cax="silver"

T0=["C",-3.2,3.2]; T1=["B",-0.4,1.2]; T2=["D",3.2,3.2]; T3=["A",-1.4,6.8]

linew1=3; linew2=1
Co1="lightgreen"