What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_5, if x_5 listens to a song, then x_5 is a writer. For all x_5, x_5 will listen to a song. For all x_5, x_5 will play squash if and only if x_5 is a writer.
For all x_5, x_5 is a writer. For all x_5, if x_5 plays squash, then x_5 is a writer. For all x_5, if x_5 were a writer, then x_5 is playing squash.