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 Charles were poor, then Linda is running. If Charles were fast, then Linda is running. If Linda goes running, then Patricia is taking a plane. If Patricia takes a plane, then Charles is fast.
If Charles were poor, then Patricia is taking a plane can be inferred via the transitivity rule. If Charles were fast, then Patricia is taking a plane can be inferred via the transitivity rule. If Linda goes running, then Charles is fast can be inferred via the transitivity rule. If Patricia takes a plane, then Linda is running can be inferred via the transitivity rule.