Which cards in mahjong terms are "leather jackets with knives"?

A leather jacket with a knife, also known as a hanging doll, is three identical cards plus an adjacent card. For example, if you have three 2 1000 and 30000, your mouth is 10000, 40000 and 30000, and so on.

Mahjong, a four-player domino game, is a game play and entertainment equipment invented by ancient people in China, with 144 pieces, including disks, flowers and ordinal numbers, which originated in China.

Mahjong is popular in China cultural circle, and it is commonly known as sparrow in Guangdong, Hong Kong and Macao and southern Fujian. Generally, patterns or characters are carved on a small rectangle made of bamboo, bone or plastic, and the corresponding five standard States are eating, touching, touching, listening and Hu.