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There are 3 suits in the Mahjong tile set: circles, bamboo and thousands - each suit has numbers 1 to 9 and have 4 of each number. To make a pair with a suit tile you need to pick the same number and suit.
Winds
There are also 4 types of Wind tiles - North, South, West and East with 4 each of these. To make a matching pair - pick 2 of the same wind tiles.
Dragons
With 3 types of dragons - red, white and green - again there are 4 each of these. A pair of dragons will be 2 of the same color.
Seasons
There is 1 tile for each season - so to make a matching pair just choose any 2 of the season tiles.
Flowers
There are 4 flower tiles - plum, orchid, chrystanthemum and bamboo. Match any 2 of these to make a pair.
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