What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all y_4, if y_4 cooks, then y_4 is playing squash. There is at least one y_4 for which y_4 will cook or y_4 will not play squash.
There is at least one y_4 for which if y_4 plays squash, then y_4 is cooking can be inferred via the existential rewriting rule.