What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: If Karen were a musician, then Jessica is happy. If Jessica were happy, then Karen is an astronaut. For all x_10, if x_10 were an astronaut, then x_10 is a musician.
If Karen were a musician, then Karen is an astronaut can be inferred via the transitivity rule.