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