What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Linda plays squash, then Patricia is not sad. For all z, if z were an artist, then z is playing squash. Patricia is sad. For all z, if z plays squash, then z is an artist.
Linda is not playing squash. For all z, z is an artist if and only if z will play squash. For all z, z will play squash if and only if z is an artist.