What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_7, x_7 is an office clerk. For all x_7, x_7 is an office clerk if and only if x_7 is sad. There is at least one x_7 for which x_7 will play squash.
There is at least one x_7 for which x_7 will play squash and x_7 is an office clerk. There is at least one x_7 for which x_7 is an office clerk and x_7 will play squash. For all x_7, if x_7 were an office clerk, then x_7 is sad. For all x_7, if x_7 were sad, then x_7 is an office clerk.