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 will climb a mountain or x_11 is a politician. There is at least one x_11 for which if x_11 were happy, then x_11 is not a nurse. For all x_11, x_11 will climb a mountain if and only if x_11 is a nurse. For all x_11, x_11 is a politician if and only if x_11 is a nurse.
For all x_11, if x_11 climbs a mountain, then x_11 is a nurse. For all x_11, if x_11 were a politician, then x_11 is a nurse. For all x_11, if x_11 were a nurse, then x_11 is climbing a mountain. For all x_11, if x_11 were a nurse, then x_11 is a politician.