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\( \dfrac{1}{6} \left( \dfrac{1}{|R_1|} + \dfrac{1}{|R_2|} \right) \)

\( \dfrac{1}{6} \left( \dfrac{1}{|R_1|} - \dfrac{1}{|R_2|} \right) \)

\( -\dfrac{1}{6} \left( \dfrac{1}{|R_1|} - \dfrac{1}{|R_2|} \right) \)

\( -\dfrac{1}{6} \left( \dfrac{1}{|R_1|} + \dfrac{1}{|R_2|} \right) \)