theta_{s} ~ DirSym(alpha, T), s \in [1,S] pi ~ DirSym(gamma, S) phi_{s,t} ~ DirSym(beta, V), s \in [1,S], t \in [1,T] l_{d} ~ Mult(pi), d \in [1,D] z_{d,n} ~ Mult(theta_{l_{d}}), d \in [1,D] , n \in [1,N_{d}] w_{d,n} ~ Mult(phi_{l_{d}, z_{d,n}}), d \in [1,D] , n \in [1,N_{d}]