DIM a$
DIM b$

INPUT "Enter a value for a$ ", a$

INPUT "Enter a value for b$ ", b$

IF a$ = b$ OR a$ = b$ OR a$ = b$  THEN ?  "Passed case 1"

IF a$ <> b$ OR a$ <> b$ OR a$ <> b$  THEN ?  "Passed case 2"

Result:

Enter a value for a$ 65
Enter a value for b$ 31
Passed case 2