( | 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     )            ( 2 )    MathType@MTEF@5@5@+=feaafiart1ev1aaatCvAUfKttLearuWrP9MDH5MBPbIqV92AaeXatLxBI9gBaebbnrfifHhDYfgasaacH8akY=wiFfYdH8Gipec8Eeeu0xXdbba9frFj0=OqFfea0dXdd9vqai=hGuQ8kuc9pgc9s8qqaq=dirpe0xb9q8qiLsFr0=vr0=vr0dc8meaabaqaciaacaGaaeqabaqabeGadaaakeaadaqadiqaauaabeqaceaaaeaacqGG8baFcuWGgbGrgaqeamaaBaaaleaacqWGPbqAaeqaaOGaeyykICSafm4raCKbaebadaWgaaWcbaGaemOAaOgabeaakiabcYha8bqaaiabikdaYaaaaiaawIcacaGLPaaacqGHsisldaaeqbqaamaabmGabaqbaeqabiqaaaqaaiabcYha8jabdAeagnaaBaaaleaacqWGRbWAaeqaaOGaeyykICSafm4raCKbaebadaWgaaWcbaGaemOAaOgabeaakiabcYha8bqaaiabikdaYaaaaiaawIcacaGLPaaaaSqaaiabdUgaRjabgcMi5kabdMgaPbqab0GaeyyeIuoakiabgkHiTmaaqafabaWaaeWaceaafaqabeGabaaabaGaeiiFaWNafmOrayKbaebadaWgaaWcbaGaemyAaKgabeaakiabgMIihlabdEeahnaaBaaaleaacqWGSbaBaeqaaOGaeiiFaWhabaGaeGOmaidaaaGaayjkaiaawMcaaaWcbaGaemiBaWMaeyiyIKRaemOAaOgabeqdcqGHris5aOGaey4kaSYaaabuaeaadaaeqbqaamaabmGabaqbaeqabiqaaaqaaiabcYha8jabdAeagnaaBaaaleaacqWGRbWAaeqaaOGaeyykICSaem4raC0aaSbaaSqaaiabdYgaSbqabaGccqGG8baFaeaacqaIYaGmaaaacaGLOaGaayzkaaaaleaacqWGSbaBcqGHGjsUcqWGQbGAaeqaniabggHiLdaaleaacqWGRbWAcqGHGjsUcqWGPbqAaeqaniabggHiLdGccaWLjaGaaCzcamaabmGabaGaeGOmaidacaGLOaGaayzkaaaaaa@802F@