M ( v , w ) = ∑ δ = h v   n − h w    N − δ   D − δ     ( v , w ) + ∑ δ = h w   n − h v    N δ  D δ    ( v , w )       ( 52 )   MathType@MTEF@5@5@+=feaafiart1ev1aaatCvAUfKttLearuWrP9MDH5MBPbIqV92AaeXatLxBI9gBaebbnrfifHhDYfgasaacH8akY=wiFfYdH8Gipec8Eeeu0xXdbba9frFj0=OqFfea0dXdd9vqai=hGuQ8kuc9pgc9s8qqaq=dirpe0xb9q8qiLsFr0=vr0=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@6D1F@