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A tetraquark state may be an admixture of a $6_c-\\bar 6_c$ state and a $\\bar 3_c-3_c$ one, where $6_c-\\bar 6_c$($\\bar 3_c-3_c$) denotes the color configuration with a $6_c$ ($\\bar 3_c$) diquark and a $\\bar 6_c$ ($3_c$) antidiquark. 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