What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z_2, if z_2 were a poet, then z_2 is a sailor. There is at least one z_2 for which z_2 is not a sailor. For all z_2, if z_2 were a poet, then z_2 is running. For all z_2, if z_2 goes running, then z_2 is a poet.
There is at least one z_2 for which z_2 is not a poet. For all z_2, if z_2 goes running, then z_2 is a sailor. For all z_2, z_2 is a poet if and only if z_2 will go running. For all z_2, z_2 will go running if and only if z_2 is a poet.