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 John were a scientist, then Charles is not playing squash. For all x_14, x_14 will play tennis. For all x_14, if x_14 were a writer, then x_14 is playing squash. For all x_14, if x_14 plays tennis, then x_14 is a writer.
For all x_14, x_14 is a writer can be inferred via the universal modus ponens rule. For all x_14, if x_14 plays tennis, then x_14 is playing squash can be inferred via the universal transitivity rule.