What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_11, x_11 will play tennis if and only if x_11 is happy. There is at least one x_11 for which x_11 is a musician or x_11 will not play tennis. For all x_11, x_11 is not a musician.
There is at least one x_11 for which if x_11 plays tennis, then x_11 is a musician. For all x_11, if x_11 plays tennis, then x_11 is happy. For all x_11, if x_11 were happy, then x_11 is playing tennis.