What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_7, x_7 will play tennis if and only if x_7 is a scientist. Joseph is playing tennis if and only if it is snowing. Joseph is not a scientist.
If Joseph plays tennis, then it is snowing. If it snows, then Joseph is playing tennis. For all x_7, if x_7 plays tennis, then x_7 is a scientist. For all x_7, if x_7 were a scientist, then x_7 is playing tennis.