What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Charles is playing tennis. Richard is not a server. For all z_4, z_4 is a server or z_4 will cook. If Charles were a musician, then Charles is not playing tennis.
Charles is not a musician. Charles is playing tennis and Richard is not a server. Richard is not a server and Charles is playing tennis.