What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y_1, if y_1 goes running, then y_1 is a mechanic. For all y_1, y_1 is a mechanic if and only if y_1 will work. For all y_1, y_1 will work or y_1 will go running.
For all y_1, if y_1 were a mechanic, then y_1 is working. For all y_1, if y_1 works, then y_1 is a mechanic.