What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x, if x were a sailor, then x is climbing a mountain. For all x, if x climbs a mountain, then x is a sailor. For all x, x will climb a mountain or x is not fast.
For all x, if x were fast, then x is climbing a mountain. For all x, x is a sailor if and only if x will climb a mountain. For all x, x will climb a mountain if and only if x is a sailor.