10 HGR
11 GOTO 15
12 HPLOT 139,0 TO 139,191 TO 140,191 TO 140,0: HPLOT 0,95 TO 279,95 TO 279,96 TO 0,96
15 A = 70:B = 48
17 X =  RND (1) * 139:Y =  RND ( 1) * 95
20  HPLOT A,B TO X,Y: HPLOT  - A + 280,B TO  - X + 280,Y: HPLOT A, - B + 192 TO X, - Y + 192 : HPLOT  - A + 280, - B + 192 TO  - X + 280, - Y + 192
21  HCOLOR= 0: HPLOT A,B TO X,Y: HPLOT  - A + 280,B TO  - X + 280,Y: HPLOT A, - B + 192 TO X, - Y + 192: HPLOT  - A + 280, - B + 192 TO  - X + 280, - Y + 192
23 H = H + 1: IF H = 8 THEN H = 0
24  HCOLOR= 3
25 A = X:B = Y: GOTO 17