As an analogy, suppose that you are talking with some friends. People listen and if
no one is talking they can talk. If you want to say something, you wait until the speaker
is done and then you try to talk. Usually, people yield to the first person who jumps
in at the precise moment the previous speaker stops. Sometimes two people attempt to
talk at the same time, so there must be some technique to continue the conversation after
such a verbal collision occurs.