∑ i  ∑ j  ∑ k ≠ i   | F i  ∩ G j  | | F i  ∩ G ¯  j  | | F k  ∩ G ¯  j  | | F k  ∩ G j  |           ( 7 )      MathType@MTEF@5@5@+=feaafiart1ev1aaatCvAUfKttLearuWrP9MDH5MBPbIqV92AaeXatLxBI9gBaebbnrfifHhDYfgasaacH8akY=wiFfYdH8Gipec8Eeeu0xXdbba9frFj0=OqFfea0dXdd9vqai=hGuQ8kuc9pgc9s8qqaq=dirpe0xb9q8qiLsFr0=vr0=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@6613@