It's encouraged to be specific with requests.
Cindy's friends ask her what she wants to order for lunch.
Cindy wants to eat food she likes.
Cindy asks for a number 6 xor [exclusive or] a number 9 from the fast food place.
Cindy asks for a number 6 or a number 9 from the fast food place.
Her friends flip a coin and it lands tails, thus they get a number 9 for her.
Cindy gets a number 6 AND a number 9, since they thought she meant inclusive or.