What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x, if x plays tennis, then x is a musician. There is at least one x for which if x takes a plane, then x is sad. For all x, if x plays tennis, then x is taking a plane. For all x, if x were sad, then x is cooking. For all x, if x were a musician, then x is playing tennis.
For all x, if x were a musician, then x is taking a plane. There is at least one x for which if x takes a plane, then x is cooking. There is at least one x for which if x plays tennis, then x is sad. For all x, x will play tennis if and only if x is a musician. For all x, x is a musician if and only if x will play tennis.