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, if x_7 were a taxi driver, then x_7 is cooking. There is at least one x_7 for which x_7 is sad. For all x_7, x_7 is a taxi driver and x_7 is a scientist.
For all x_7, x_7 is a taxi driver. For all x_7, x_7 is a scientist.