No documentation. A_4(k-1,j,i) A_1(j,i) A_2(k,j-1,i) A_4(k-1,i,i) A_1(i,i) A_2(k,j-1,i) A_4(k-1,i,i) A_1(i,i) A_4(k-1,j,i) A_1(j,i) x_1(1) broadcast A_5(k,j-1,i) A_4(k-1,k,i) phi_1(k,j,k) broadcast A_4(k-1,j,i) A_1(j,i) A_5(k,j-1,i) A_4(k-1,k,i) phi_1(k,j,k) broadcast A_4(k-1,j,i) A_1(j,i) temp_A_1(k,j,i) A_2(i,N+1,i) A_5(i,N+1,j) A_3(i-1,i,i-1) A_3(j,i,j)