 So while the first reference may be “the dog with the pink leash next to the birch tree,” the second reference may become “the dog near the birch tree”, and the third may be “the birch tree dog”.But when a conversation partner C only listens to the conversation between A and B and doesn't participate, the references made earlier (although he heard all of them) are not as efficient when C switches places with B.As a matter of fact, he is treated like a novice in the conversation, despite having heard A and B use the references previously.