What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_17, x_17 is a poet or x_17 will sleep. For all x_17, x_17 is not a poet. If Linda climbs a mountain, then Richard is not rich. For all x_17, x_17 will not sleep.
Since the premises are contradictory, we can infer anything from them.