What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Robert plays squash, then Robert is cooking. For all x_9, x_9 will play squash if and only if x_9 will cook.
For all x_9, if x_9 plays squash, then x_9 is cooking. For all x_9, if x_9 cooks, then x_9 is playing squash.