What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y, if y writes a letter, then y is cooking. For all y, y will sleep. For all y, if y plays tennis, then y is cooking. There is at least one y for which if y sleeps, then y is writing a letter.
There is at least one y for which y will write a letter. There is at least one y for which if y sleeps, then y is cooking.