_(1)-(F)_(2)-|||-C. dfrac (2)(3)(F)_(1)+dfrac (1)(3)(F)_(2)-|||-D. dfrac (2)(3)(F)_(1)-dfrac (1)(3)(F)_(2)-|||-E. dfrac (1)(3)(F)_(1)+dfrac (2)(3)(F)_(2)-|||-F. dfrac (1)(3)(F)_(1)-dfrac (2)(3)(F)_(2)

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