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HELP

function f(x) { y = 1+x; return y }
function g(x) { y = 0.8+x; return y }
function h(x) { y = 1.5+5/7*x; return y }
function k(x) { y = 2+0.5*x; return y }

aX = 0; bX = 4; aY = 0; bY = 5
Dx = 1; Dy = 1

C1="black"; L1x=[0,4]; L1y=[0,1.5*4]

C2=C3=C4="brown"
L2x=[1-1/4,1+1/4,1+1/4,1-1/4,1-1/4]; L2y=[2-1/4,2-1/4,2+1/4,2+1/4,2-1/4]
L3x=[2-1/4,2+1/4,2+1/4,2-1/4,2-1/4]; L3y=[2.75-1/4,2.75-1/4,2.75+1/4,2.75+1/4,2.75-1/4]
L4x=[2.75-1/4,2.75+1/4,2.75+1/4,2.75-1/4,2.75-1/4]; L4y=[3.75-1/4,3.75-1/4,3.75+1/4,3.75+1/4,3.75-1/4]

AX=BX=AY=BY=""
BX="V"; BY="U"

AAX=aX; BBX=bX; AAY=aY; BBY=bY

T0=["A",3.6,4.85]; T1=["B",0.2,0.75]; T2=["C",0.4,0.35]; T3=["D",0.1,1.38]; T4=["E",3.8,3.7]