∑ 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@