They have at least two candidate cities in California to visit.
Mr. and Mrs. Smith make a travel plan, they want to go to a city in California or Florida, and where neither of them has ever been. Cities in California that they are interested in are San Francisco, Los Angeles, and San Diego. Cities in Florida that they are interested in are Orlando and Miami. Mr. Smith has been to two cities in California. Mrs. Smith has been to one city in Florida.
∀x (WantToGo(x) → (California(x) ∨ Florida(x)) ∧ (NeverGo(x))) ∀x (((SanFrancisco(x) ∨ LosAngeles(x) ∨ SanDiego(x)) ∧ California(x)) → WantToGo(x)) ∀x ((Orlando(x) ∨ Miami(x)) ∧ Florida(x)) → WantToGo(x)) CaliforniaCityVisited(mr.smith, two) FloridaCityVisited(mrs.smith, one)