Each valid mahjong hand contains four melds and one pair.
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Summary and reflection accelerate skill improvement speed.
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Making a kong allows players to draw an extra supplement tile.
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Official competitions set clear skill assessment standards.
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Official competitions set clear skill assessment standards.
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Every stage of learning has different gaming experiences.
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Professional players can keep calm in critical moments.
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Human strategy determines the final game result.
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Official mahjong competitions have strict and fixed rules.
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