graphsize 430,418
cls
color white
rect 0,0,graphwidth,graphheight

color black
for i=9 to 359 step 100
rect(9+i,9,50,50)
next i
for i=9 to 359 step 100
rect(59+i,59,50,50)
next i

for i=9 to 359 step 100
rect(9+i,109,50,50)
next i
for i=9 to 359 step 100
rect(59+i,159,50,50)
next i

for i=9 to 359 step 100
rect(9+i,209,50,50)
next i
for i=9 to 359 step 100
rect(59+i,259,50,50)
next i

for i=9 to 359 step 100
rect(9+i,309,50,50)
next i
for i=9 to 359 step 100
rect(59+i,359,50,50)
next i