SIT TechniqueEx[X]=Ey[E[XโฃY]]\mathbb{E}_x[X] = \mathbb{E}_y [\mathbb{E}[X|Y]]Exโ[X]=Eyโ[E[XโฃY]] E[g(x,ย y,ย z)]=Ez[Eyโฃz[Exโฃy,z[g(x,ย y,ย z)โฃy,ย z]]]\mathbb{E}[g(x,~y,~z)] = \mathbb{E}_z [\mathbb{E}_{y|z}[ \mathbb{E}_{x|y,z}[g(x,~y,~z)|y,~z]]]E[g(x,ย y,ย z)]=Ezโ[Eyโฃzโ[Exโฃy,zโ[g(x,ย y,ย z)โฃy,ย z]]]