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: Charles is taking a plane if and only if Jessica is not listening to a song. Mary is not a sailor. Mary is a sailor if and only if Jessica is listening to a song.
If Charles takes a plane, then Jessica is not listening to a song can be inferred via the biconditional elimination rule. If Mary were a sailor, then Jessica is listening to a song can be inferred via the biconditional elimination rule. If Jessica doesn't listen to a song, then Charles is taking a plane can be inferred via the biconditional elimination rule. If Jessica listens to a song, then Mary is a sailor can be inferred via the biconditional elimination rule. Jessica is not listening to a song can be inferred via the biconditional elimination rule.