Upstairs, I wonder if it was deducted from that book. But in real practical work, although the theory is still combined everywhere. But not exactly the same. In fact, the flow of a ticket depends on what industry position you are in. Second-class freight forwarders and 1 freight forwarders or shipowners or others are expanding part of the traffic for practical reasons. And the other part of the content is inaccessible. I suggest not to use the general delivery process to be too general. Find a teacher to teach you slowly.