Generally speaking, according to the mahjong rules in most areas, when playing Hu cards, there are generally 14 cards in hand. It includes four groups of three cards of the same color, plus one card, which can be any card. Before Hu cards, everyone will start with thirteen cards and then touch a card. Keep it if it works, and destroy it if it doesn't. In the process of continuous combination and playing cards, fourteen cards that meet the requirements of Hu cards are finally combined.
It is recommended that you consult local mahjong rules or local mahjong lovers for the most accurate information.