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 if y goes running, then y is a writer. For all y, if y takes a plane, then y is a writer. For all y, y will go running if and only if y is a writer.
For all y, if y goes running, then y is a writer. For all y, if y were a writer, then y is running.