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- 10 SCREEN 2:CLS:KEY OFF
- 20 Q=1
- 30 C=1:D=1
- 40 C1=1:D1=1
- 50 IF C=640 AND D=0 THEN C=54:D=1:GOTO 120
- 60 IF C=54 AND D=1 THEN C=13:D=1:GOTO 120
- 70 IF C=13 AND D=1 THEN Q=ABS(Q=0):GOTO 30
- 80 IF C=640 THEN C1=-1
- 90 IF C=0 THEN C1=1
- 100 IF D=200 THEN D1=-1
- 110 IF D=0 THEN D1=1
- 120 C=C+C1
- 130 D=D+D1
- 140 PSET(C,D),Q
- 150 IF INKEY$=CHR$(27) THEN 170
- 160 GOTO 50
- 170 END