What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_12, x_12 is not a police officer. There is at least one x_12 for which x_12 will work if and only if x_12 is a sailor. For all x_12, x_12 is a sailor if and only if x_12 will play squash. For all x_12, x_12 will play tennis if and only if x_12 is a police officer. For all x_12, if x_12 plays squash, then x_12 is playing tennis.
For all x_12, if x_12 were a sailor, then x_12 is playing squash. For all x_12, if x_12 plays tennis, then x_12 is a police officer. There is at least one x_12 for which if x_12 works, then x_12 is a sailor. For all x_12, if x_12 plays squash, then x_12 is a sailor. For all x_12, if x_12 were a police officer, then x_12 is playing tennis. There is at least one x_12 for which if x_12 were a sailor, then x_12 is working. For all x_12, x_12 will not play tennis.