Which direction can pigs win by playing mahjong during the day?

It is a state of mind, a stable state of mind. Playing mahjong is a skill, including post-black studies and other humanities. In other words, it includes operations research, logic, probability theory, combinatorial arrangement and so on. Theoretically speaking, the hand is not ostentatious when it is in sequence, and the hand laughs at the back, regardless of the temporary gains and losses.