What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Karen is making tea. If Charles plays a game, then Karen is not making tea. David is not a musician. For all x, x is a nurse if and only if x is a musician.
Charles is not playing a game. Karen is making tea and David is not a musician. David is not a musician and Karen is making tea. For all x, if x were a nurse, then x is a musician. For all x, if x were a musician, then x is a nurse.