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: If Barbara makes tea, then Barbara is playing squash. For all x_9, x_9 will make tea or x_9 will not play squash.
For all x_9, if x_9 plays squash, then x_9 is making tea can be inferred via the universal rewriting rule.