What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_17, if x_17 climbs a mountain, then x_17 is a writer. For all x_17, if x_17 were a writer, then x_17 is climbing a mountain. For all x_17, if x_17 climbs a mountain, then x_17 is sad. There is at least one x_17 for which x_17 is not sad. For all x_17, x_17 is a writer or x_17 will cook.
There is at least one x_17 for which x_17 will not climb a mountain. For all x_17, if x_17 were a writer, then x_17 is sad. For all x_17, x_17 will climb a mountain if and only if x_17 is a writer. For all x_17, x_17 is a writer if and only if x_17 will climb a mountain.