What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_7, x_7 is not an astronaut. For all x_7, if x_7 were a poet, then x_7 is an astronaut. For all x_7, x_7 is an artist. For all x_7, x_7 is a poet.
Since the premises are contradictory, we can infer anything from them.