What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Michael is an artist if and only if Susan is a writer. If Karen plays a game, then Susan is a writer. If Susan were a writer, then Joseph is working. Michael is not an artist. If Joseph works, then Karen is playing a game.
If Karen plays a game, then Joseph is working. If Susan were a writer, then Karen is playing a game. If Joseph works, then Susan is a writer. If Michael were an artist, then Susan is a writer. If Susan were a writer, then Michael is an artist. Susan is not a writer.