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: Linda is a taxi driver if and only if it is cold. It is sunny or it is cold. If Joseph sleeps, then Linda is a taxi driver. If it is sunny, then Joseph is sleeping.
If it is sunny, then Linda is a taxi driver can be inferred via the transitivity rule. If Linda were a taxi driver, then it is cold can be inferred via the biconditional elimination rule. If it is cold, then Linda is a taxi driver can be inferred via the biconditional elimination rule.