$$BR^2_{1}(Q^2_{1},Q^2_{1})\quad U=\pmatrix{1 & 2 \cr 1 & 2}\quad D=\pmatrix{1 & 2 \cr 1 & 2}\quad \hbox{order 2} \quad S, c_1 = 4, c_2 = 0$$
$$BR^2_{2}(Q^2_{1},-)\quad U=\pmatrix{2 & 1 \cr 2 & 1}\quad D=\pmatrix{1 & 2 \cr 1 & 2}\quad \hbox{order 4} \quad c_1 = 4, c_2 = 0$$