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Results:
null method : 1）帰無法 2）零点法
null matrix : 1）零行列
null vector : 1）零ベクトル
null set : 1）（数学で）空集合
null mutation : 1）無発現変異
null tree : 1）空木
nucleation : 1）核形成 2）核生成
null space : 1）零空間
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null method

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