What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Joseph is climbing a mountain if and only if Jennifer is playing squash. Jennifer is not playing squash. Joseph is climbing a mountain if and only if Joseph is cooking.
If Joseph climbs a mountain, then Jennifer is playing squash. If Joseph climbs a mountain, then Joseph is cooking. If Jennifer plays squash, then Joseph is climbing a mountain. If Joseph cooks, then Joseph is climbing a mountain. Joseph is not climbing a mountain.