shared ( v , v ′   )  = ∑ i  ∑ j  ( | F i  ∩ G j  |    2     )      ( ( | F ¯  i  ∩ G ¯  j  |    2     )  − ∑ k ≠ i   ( | F k  ∩ G ¯  j  |    2     )         − ∑ l ≠ j   ( | F ¯  i  ∩ G l  |    2     )  + ∑ k ≠ i   ∑ l ≠ j   ( | F k  ∩ G l  |    2     )         )            ( 3 )    MathType@MTEF@5@5@+=feaafiart1ev1aaatCvAUfKttLearuWrP9MDH5MBPbIqV92AaeXatLxBI9gBaebbnrfifHhDYfgasaacH8akY=wiFfYdH8Gipec8Eeeu0xXdbba9frFj0=OqFfea0dXdd9vqai=hGuQ8kuc9pgc9s8qqaq=dirpe0xb9q8qiLsFr0=vr0=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@A3C6@