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 it is windy, then Barbara is playing tennis. For all x, if x drinks water, then x is playing tennis. It is snowing or it is windy. It is not snowing or Barbara is drinking water.
It is windy or Barbara is drinking water can be inferred via the resolution rule. If Barbara drinks water, then it is not snowing can be inferred via the rewriting rule.