You can send it. If you don't open the house, you can give up opening at the beginning of 4, and you can also send 4 when you leave the door. Enough bridge, known as China Bridge, originated in Qingdao, Shandong Province, China. This is a highly intelligent, competitive and interesting poker entertainment, with special emphasis on federal cooperation. Also called hook or hook. Sufficient activity originated in Qingdao in the early 1960 s, spread in Jiaodong Peninsula in the 1970 s and 1980 s, and then gradually expanded from east to west and from coastal to inland.