With the RelaX relational algebra calculator, and using the UIBK Pizza database system, write a relational algebra expression that results in all of the people that frequent Pizza Hut that eat pizza that Amy also eats.

My solution is:

name ( name = 'Amy' (Eats) ( pizzeria = 'Pizza Hut' (Frequents)))

but I think it's wrong because the solution should be Amy, Ben, and Gus.