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function f(x) { y = 1/0; return y }
function g(x) { y = 19.17*x; return y }
function h(x) { y = 21*x; return y }
function k(x) { y = 1/0; return y }

aX = 0; bX =50; aY = 0; bY = 1000
Dx = 5; Dy = 100

xx=[10,20,30,40,50]; yy=[500]
Px=[0]; Py=[0]; Lx=[11-2,11+2,11+2,11-2,11-2]; Ly=[220-5,220-5,220+5,220+5,220-5]
L1x=[16-2,16+2,16+2,16-2,16-2]; L1y=[350-5,350-5,350+5,350+5,350-5]
L2x=[30-2,30+2,30+2,30-2,30-2]; L2y=[590-5,590-5,590+5,590+5,590-5]
L3x=[47-2,47+2,47+2,47-2,47-2]; L3y=[940-5,940-5,940+5,940+5,940-5]
Qx=[18,45]; Qy=[345,945]

AX=BX=AY=BY=""
AAX="0"; BBX="50"; AAY="0 "; BBY="1000"