I used a key chain with a Chinese knot when I was an undergraduate. After a long time, the Chinese knot on it broke up in half. Once, I waited for the bus at the school gate and ate a string of pork tenderloin by the way. When I got off the bus, I found that I had lost my key. After a week, I went to eat the tenderloin and saw this bunch of keys hanging on the wall at a glance. The boss said it was from the girl who was waiting for the bus with me, and that I left it in my seat when I got off the bus. She didn't know me, so she sent it to the tenderloin shop. I asked my boss how the Chinese knot was rearranged, but he said he didn't know. It was sent like this.