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American Mahjong practice based on NMJL rules. Charleston exchange, Joker tiles, C/X hands, Quints & Sextets. 100% offline, no ads. American Mahjong is a variant of mahjong played in the United States, standardized by the **National Mah Jongg League (NMJL)** since 1937. Unlike Chinese mahjong, which uses a "4 melds + 1 pair" formula, American mahjong hands are defined by an **annual rule card** that changes every April.
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