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100 DEFINT A-Z110 C=15*8:'Y*8120 SCREEN 12130 COLOR 255,0,0140 FOR J=-32 TO 31150 X=128+J*256/64160 LINE(X+2,0)-(X+2,211),C+(J AND 7)170 LINE(X+3,0)-(X+3,211),C+(J AND 58)/8180 NEXT J190 FOR K=-32 TO 31200 Y=106+K*212/64210 LINE(0,Y)-(0,Y+3),C+(K AND 7)220 LINE(1,Y)-(1,Y+3),C+(K AND 56)/8230 NEXT K240 FOR X=4 TO 255 STEP 4250 COPY(0,0)-(1,211)TO(X,0)260 NEXT X270 GOTO 270
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