What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_1, x_1 will not climb a mountain. There is at least one x_1 for which x_1 is a server if and only if x_1 will climb a mountain.
There is at least one x_1 for which if x_1 were a server, then x_1 is climbing a mountain. There is at least one x_1 for which if x_1 climbs a mountain, then x_1 is a server. There is at least one x_1 for which x_1 is not a server.