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: Jennifer is playing squash if and only if Jennifer is running. For all x_13, if x_13 were a bartender, then x_13 is playing squash. Jennifer is not playing squash. For all x_13, if x_13 goes running, then x_13 is a bartender.
If Jennifer plays squash, then Jennifer is running can be inferred via the biconditional elimination rule. If Jennifer goes running, then Jennifer is playing squash can be inferred via the biconditional elimination rule. For all x_13, if x_13 goes running, then x_13 is playing squash can be inferred via the universal transitivity rule.