What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Joseph is drinking water. If it snows, then Joseph is not drinking water. Elisabeth is an astronaut or Jennifer is a scientist. Elisabeth is an astronaut if and only if it is snowing.
It is not snowing. If Elisabeth were an astronaut, then it is snowing. If it snows, then Elisabeth is an astronaut.