What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_5, if x_5 takes a plane, then x_5 is not a doctor. There is at least one x_5 for which if x_5 were a poet, then x_5 is taking a plane. For all x_5, x_5 is a doctor. For all x_5, if x_5 takes a plane, then x_5 is a poet.
For all x_5, x_5 will not take a plane. There is at least one x_5 for which x_5 is a poet if and only if x_5 will take a plane. There is at least one x_5 for which x_5 will take a plane if and only if x_5 is a poet.