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 Mary plays squash, then it is overcast. Mary is playing squash or it is not snowing. If it rains, then Mary is playing squash. It is raining or it is snowing.
If it rains, then it is overcast can be inferred via the transitivity rule. If it snows, then Mary is playing squash can be inferred via the rewriting rule.