10 FOR X=1 TO 10
20 FOR Y=1 TO 10
30 FOR X=1 TO 10
40 POP
50 TRAP 1000
60 NEXT Y
70 STOP
1000 FOR X=1 TO 10
1005 IF X=2 THEN 2000
1010 FOR Y=1 TO 10
1020 GOSUB 1040
1030 GOTO 1070
1040 FOR X=1 TO 10
1050 POP
1060 RETURN
1070 POP
1080 NEXT X
2000 PRINT "PASS":END
