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: Sarah is not drinking water. If Thomas plays squash, then Sarah is drinking water. If John were not a lawyer, then Mary is cooking. If John were a lawyer, then Thomas is playing squash.
Thomas is not playing squash can be inferred via the modus tollens rule. If John were a lawyer, then Sarah is drinking water can be inferred via the transitivity rule.