(B) dfrac (1)(2)(X)_(1)+dfrac (1)(2)(X)_(2)-|||-(C) dfrac (1)(2)(X)_(1)+dfrac (1)(3)(X)_(2)+dfrac (1)(6)(X)_(3) . (D) dfrac (1)(2)(X)_(1)+dfrac (1)(4)(X)_(2)+dfrac (1)(4)(X)_(3)

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