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, if x_1 climbs a mountain, then x_1 is sad. For all x_1, if x_1 were a scientist, then x_1 is sad. There is at least one x_1 for which x_1 is a scientist or x_1 will play squash. For all x_1, if x_1 plays squash, then x_1 is climbing a mountain.
For all x_1, if x_1 plays squash, then x_1 is sad.