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: Charles is playing squash if and only if Jennifer is cooking. Jennifer is cooking or Charles is not playing squash. For all x_17, x_17 will not play squash.
If Charles plays squash, then Jennifer is cooking can be inferred via the rewriting rule. If Charles plays squash, then Jennifer is cooking can be inferred via the biconditional elimination rule. If Jennifer cooks, then Charles is playing squash can be inferred via the biconditional elimination rule.