What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_10, if x_10 were a cashier, then x_10 is an astronaut. For all x_10, if x_10 were a musician, then x_10 is a cashier. For all x_10, x_10 is a musician if and only if x_10 is an astronaut. For all x_10, if x_10 were a musician, then x_10 is an astronaut.
For all x_10, if x_10 were a musician, then x_10 is an astronaut. For all x_10, if x_10 were a musician, then x_10 is an astronaut. For all x_10, if x_10 were an astronaut, then x_10 is a musician.