What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y_2, y_2 is an office clerk if and only if y_2 will cook. For all y_2, if y_2 cooks, then y_2 is an office clerk. For all y_2, if y_2 were an office clerk, then y_2 is cooking.
For all y_2, y_2 will cook if and only if y_2 is an office clerk. For all y_2, y_2 is an office clerk if and only if y_2 will cook. For all y_2, if y_2 were an office clerk, then y_2 is cooking. For all y_2, if y_2 cooks, then y_2 is an office clerk.