I think it's not really possible to type a person with 2 answers. But, suppose, you have only time for 2 questions to determine if someone is S or N and then, if the S is an SJ or SP. Or in the other case if the N is NT or NF. So:
- Question 1 -> to determine if someone is S or N,
- Question 2a -> to determine if the S is J or P or
- Question 2b -> to determine if the N is T or F.
What would you ask?