Code:
IF key1=3 THEN
	IF key2=4 THEN
		IF key3=5 THEN
			IF key4 = 6 THEN CodeRight
		ENDIF
	ENDIF
ENDIF
' Continue on here – code did not match




CodeRight:	' Subroutine, jump to here – code matches
OR

Code:
IF (key1=3) AND (key2=4) AND (key3 = 5) AND (key4=6) THEN CodeRight