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 Susan goes running, then it is late. If it is late, then it is cold. Karen is a cashier if and only if it is cold.
If Susan goes running, then it is cold can be inferred via the transitivity rule. If Karen were a cashier, then it is cold can be inferred via the biconditional elimination rule. If it is cold, then Karen is a cashier can be inferred via the biconditional elimination rule.