What is the origin of Nantong Longka?

Nantong brand, China people always like to rub it eight times on the table or swim to call it. Recently, there have been many medical researches.

At present, the elderly in Nantong can play dragon cards to prevent Alzheimer's disease. There is no denying that mahjong is a game that one cannot play by himself.

Art, but do you know the origin of mahjong?