What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_5, if x_5 were an office clerk, then x_5 is happy. For all x_5, x_5 will cook if and only if x_5 is happy. There is at least one x_5 for which x_5 will cook.
For all x_5, if x_5 cooks, then x_5 is happy. For all x_5, if x_5 were happy, then x_5 is cooking.