10 LET A$="abcdefghijklmnopqrstuvwxyz"
15 LET n=10: LET m=7
20 PRINT A$(n TO n+m-1)
30 PRINT A$(n TO )
40 PRINT A$( TO LEN (A$)-1)
50 FOR i=1 TO LEN (A$)
60 IF A$(i)="g" THEN PRINT A$(i TO i+m-1): LET i=LEN (A$): GO TO 70
70 NEXT i
80 LET B$="ijk"
90 FOR i=1 TO LEN (A$)-LEN (B$)+1
100 IF A$(i TO i+LEN (B$)-1)=B$ THEN PRINT A$(i TO i+m-1): LET i=LEN (A$)-LEN (B$)+1:  GO TO 110
110 NEXT i
120 STOP