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 is sad and x_11 is a mechanic. For all x_11, x_11 is rich if and only if x_11 is sad. For all x_11, x_11 is a police officer.
For all x_11, x_11 is sad. For all x_11, x_11 is a mechanic. For all x_11, if x_11 were rich, then x_11 is sad. For all x_11, if x_11 were sad, then x_11 is rich.