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 it is late, then Jennifer is taking a plane. If it is cold, then Elisabeth is sleeping. If Elisabeth sleeps, then it is late. If Jennifer takes a plane, then it is cold.
If it is late, then it is cold can be inferred via the transitivity rule. If it is cold, then it is late can be inferred via the transitivity rule. If Elisabeth sleeps, then Jennifer is taking a plane can be inferred via the transitivity rule. If Jennifer takes a plane, then Elisabeth is sleeping can be inferred via the transitivity rule.