What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z, if z were a poet, then z is taking a plane. For all z, z will play squash if and only if z is a poet. There is at least one z for which if z takes a plane, then z is a poet. For all z, z will not play squash.
There is at least one z for which z will take a plane if and only if z is a poet. There is at least one z for which z is a poet if and only if z will take a plane. For all z, if z plays squash, then z is a poet. For all z, if z were a poet, then z is playing squash. For all z, z is not a poet.