ℒ ( [ S N  ( V )    S N  ( W )      ]   )  ≃ N ( [ S ( V )    S ( W )      ]  , [ σ V 2    σ V , W      σ V , W     σ W 2       ]   )        ( 29 )   MathType@MTEF@5@5@+=feaafiart1ev1aaatCvAUfKttLearuWrP9MDH5MBPbIqV92AaeXatLxBI9gBamrtHrhAL1wy0L2yHvtyaeHbnfgDOvwBHrxAJfwnaebbnrfifHhDYfgasaacH8akY=wiFfYdH8Gipec8Eeeu0xXdbba9frFj0=OqFfea0dXdd9vqai=hGuQ8kuc9pgc9s8qqaq=dirpe0xb9q8qiLsFr0=vr0=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@6F1A@