What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_8, if x_8 plays squash, then x_8 is a sailor. For all x_8, if x_8 were a sailor, then x_8 is playing squash. Elisabeth is playing squash if and only if Robert is a cashier. Elisabeth is not a sailor.
If Elisabeth plays squash, then Robert is a cashier. If Robert were a cashier, then Elisabeth is playing squash. For all x_8, x_8 will play squash if and only if x_8 is a sailor. For all x_8, x_8 is a sailor if and only if x_8 will play squash.