What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_2, if x_2 were a scientist, then x_2 is a doctor. For all x_2, if x_2 were a doctor, then x_2 is fast. There is at least one x_2 for which x_2 is not a scientist. For all x_2, if x_2 were fast, then x_2 is a scientist.
There is at least one x_2 for which x_2 is not fast. For all x_2, if x_2 were a scientist, then x_2 is fast. For all x_2, if x_2 were a doctor, then x_2 is a scientist. For all x_2, if x_2 were fast, then x_2 is a doctor.