What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_14, x_14 is an astronaut if and only if x_14 is a nurse. For all x_14, x_14 is not happy. There is at least one x_14 for which x_14 is happy or x_14 is not an astronaut.
There is at least one x_14 for which if x_14 were an astronaut, then x_14 is happy. For all x_14, if x_14 were an astronaut, then x_14 is a nurse. For all x_14, if x_14 were a nurse, then x_14 is an astronaut.