What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y, y is a poet or y will not take a plane. There is at least one y for which y will not take a plane. For all y, y is a poet if and only if y will take a plane.
For all y, if y takes a plane, then y is a poet. For all y, if y were a poet, then y is taking a plane. For all y, if y takes a plane, then y is a poet. There is at least one y for which y is not a poet.