What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_13, x_13 will cook if and only if x_13 is a cashier. For all x_13, if x_13 plays tennis, then x_13 is cooking. For all x_13, x_13 will play tennis if and only if x_13 is a cashier.
For all x_13, if x_13 cooks, then x_13 is a cashier. For all x_13, if x_13 plays tennis, then x_13 is a cashier. For all x_13, if x_13 were a cashier, then x_13 is cooking. For all x_13, if x_13 were a cashier, then x_13 is playing tennis.