What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x_7 for which if x_7 takes a plane, then x_7 is a musician. For all x_7, if x_7 were a musician, then x_7 is taking a plane. For all x_7, x_7 is a musician.
For all x_7, x_7 will take a plane. There is at least one x_7 for which x_7 will take a plane if and only if x_7 is a musician. There is at least one x_7 for which x_7 is a musician if and only if x_7 will take a plane.