SET WINDOW -4.2,4.2,-4.2,4.2
SET COLOR mode "NATIVE"
SET AREA COLOR colorindex(240/255,240/255,240/255)
FOR i=-4 TO 4
   PLOT AREA : -4,i-.02;4,i-0.02;4,i+0.02;-4,i+0.02
NEXT i
SET AREA COLOR colorindex(0/255,0/255,0/255)
FOR i=0 TO 3
   FOR j=O TO 3
      PLOT AREA : -4+2*i,-4+2*j+0.02;-4+2*i+1,-4+2*j+0.02;-4+2*i+1,-4+2*j+0.98;-4+2*i,-4+2*j+0.98
   NEXT j
NEXT i
FOR i=0 TO 2
   FOR j=O TO 3
      PLOT AREA : -2.5+2*i,-3+2*j+0.02;-2.5+2*i+1,-3+2*j+0.02;-2.5+2*i+1,-3+2*j+0.98;-2.5+2*i,-3+2*j+0.98
   NEXT j
NEXT i
FOR i=0 TO 1
   FOR j=O TO 3
      PLOT AREA : -4+7.5*i,-3+2*j+0.02;-3.5+7.5*i,-3+2*j+0.02;-3.5+7.5*i,-3+2*j+0.98;-4+7.5*i,-3+2*j+0.98
   NEXT j
NEXT i
END