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, x_1 is a scientist if and only if x_1 is a doctor. For all x_1, x_1 is a doctor or x_1 is not a politician.
For all x_1, if x_1 were a politician, then x_1 is a doctor. For all x_1, if x_1 were a scientist, then x_1 is a doctor. For all x_1, if x_1 were a doctor, then x_1 is a scientist.