What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_7, if x_7 were happy, then x_7 is a carpenter. For all x_7, x_7 is an astronaut or x_7 is happy. For all x_7, x_7 is an astronaut if and only if x_7 is a carpenter. For all x_7, if x_7 were a carpenter, then x_7 is taking a plane.
For all x_7, if x_7 were happy, then x_7 is taking a plane. For all x_7, if x_7 were an astronaut, then x_7 is a carpenter. For all x_7, if x_7 were a carpenter, then x_7 is an astronaut.