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 were a poet, then x_5 is an office clerk. For all x_5, if x_5 were an office clerk, then x_5 is a poet. For all x_5, x_5 is not a poet. For all x_5, x_5 is an office clerk if and only if x_5 is a carpenter.
For all x_5, x_5 is not an office clerk. For all x_5, x_5 is a poet if and only if x_5 is an office clerk. For all x_5, x_5 is an office clerk if and only if x_5 is a poet. For all x_5, if x_5 were an office clerk, then x_5 is a carpenter. For all x_5, if x_5 were a carpenter, then x_5 is an office clerk.