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 Elisabeth were excited, then Barbara is an astronaut. Barbara is an astronaut or Elisabeth is not playing squash. For all x_8, x_8 is excited or x_8 will play squash.
If Elisabeth plays squash, then Barbara is an astronaut can be inferred via the rewriting rule.