What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_6, x_6 will not drink water. Linda is taking a plane if and only if David is listening to a song. For all x_6, if x_6 listens to a song, then x_6 is drinking water.
If Linda takes a plane, then David is listening to a song. If David listens to a song, then Linda is taking a plane. For all x_6, x_6 will not listen to a song.