What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_12, x_12 is bored or x_12 is a poet. If John were bored, then Susan is an astronaut. If Elisabeth plays tennis, then Susan is not an astronaut. If John were a poet, then Susan is an astronaut.
Nothing can be inferred from these premises.