5 Major Pro Organizations 

Alphabet Order 

JPML Japan Professional Mahjong League

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Mahjong Union -μ-

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SPM Saikoui-Sen Nihon Pro Mahjong Kyokai

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Nihon Pro Mahjong Kyokai

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Real Mahjong Unit

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 Other Organizations 

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101 Competition League

 Major Leagues & Tournaments 

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RTD League

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Saikyo Sen