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- 10 TEXT : GR : HOME
- 20 FOR NL = 1 TO INT( RND(1) *20) +5: COLOR= INT( RND(1) *15) +1
- 30 X = INT( RND(1) *20):Y = X
- 40 DX = INT( RND(1) *3): IF DX = 2 THEN DX = -1
- 50 DY = INT( RND(1) *3): IF DY = 2 THEN DY = -1
- 60 FOR LL = 1 TO X +5
- 70 HLIN X,X AT Y: HLIN X,X AT 39 -Y: HLIN 39 -X,39 -X AT Y: HLIN 39 -X,39 -X AT 39 -Y
- 80 X = X +DX: IF ((X <0) OR (X >19)) THEN DX = DX * -1: GOTO 80
- 90 Y = Y +DY: IF ((Y <0) OR (Y >19)) THEN DY = DY * -1: GOTO 90
- 100 NEXT LL: NEXT NL: FOR P = 1 TO 6000: NEXT P: GOTO 10