10 DIM A$(20,20)
20 FOR I=1 TO 20
30 FOR J=1 TO 20
40 LET A$(I,J)=CHR$ (1+INT (RND*20))
50 NEXT J
60 NEXT I
70 FOR I=1 TO 20
80 FOR J=1 TO 20
90 PRINT CODE A$(I,J);" ";
100 IF CODE A$(I,J)=20 THEN GOTO 130
110 NEXT J
120 NEXT I