What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_11, x_11 is happy or x_11 is excited. For all x_11, x_11 is not happy. For all x_11, if x_11 were excited, then x_11 is climbing a mountain. There is at least one x_11 for which if x_11 climbs a mountain, then x_11 is excited.
For all x_11, x_11 is excited. There is at least one x_11 for which x_11 will climb a mountain if and only if x_11 is excited. There is at least one x_11 for which x_11 is excited if and only if x_11 will climb a mountain.