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 Patricia listens to a song, then Thomas is cooking. If Patricia listens to a song, then Thomas is cooking. If Thomas cooks, then Patricia is listening to a song.
Patricia is listening to a song if and only if Thomas is cooking can be inferred via the biconditional introduction rule. Patricia is listening to a song if and only if Thomas is cooking can be inferred via the biconditional introduction rule. Thomas is cooking if and only if Patricia is listening to a song can be inferred via the biconditional introduction rule. Thomas is cooking if and only if Patricia is listening to a song can be inferred via the biconditional introduction rule.