What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z, if z cooks, then z is running. For all z, if z goes running, then z is cooking. If it is sunny, then Mary is cooking.
For all z, z will cook if and only if z will go running. For all z, z will go running if and only if z will cook.