What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_16, x_16 is a police officer if and only if x_16 will play squash. There is at least one x_16 for which x_16 will not climb a mountain. For all x_16, x_16 will play squash or x_16 is sad. For all x_16, x_16 is a police officer if and only if x_16 will climb a mountain.
For all x_16, if x_16 were a police officer, then x_16 is playing squash. For all x_16, if x_16 were a police officer, then x_16 is climbing a mountain. For all x_16, if x_16 plays squash, then x_16 is a police officer. For all x_16, if x_16 climbs a mountain, then x_16 is a police officer. There is at least one x_16 for which x_16 is not a police officer.