∑Pj∈U∏k=14θ⁢[αk+η1⁡(Pj)βk+η2⁡(Pj)]⁡(zk|Ω)=∑Pj∈Uc∏k=14θ⁢[αk+η1⁡(Pj)βk+η2⁡(Pj)]⁡(zk|Ω).