What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one y for which y will go running if and only if y is a mechanic. For all y, y will go running if and only if y is a mechanic.
For all y, if y goes running, then y is a mechanic. There is at least one y for which if y goes running, then y is a mechanic. For all y, if y were a mechanic, then y is running. There is at least one y for which if y were a mechanic, then y is running.