{{b[1], b[2], b[2], b[1] + 2*b[2]}, {-b[1], b[1]/2 + b[2], b[1]/2 + b[2], 2*b[2]}, {-b[2], -b[2], b[1] + 3*b[2], b[1] + b[2]}, {-1/2*b[1] - b[2], -1/2*b[1] - b[2], -1/2*b[1] + b[2], (b[1] + 6*b[2])/2}, {-b[1] - 2*b[2], (b[1] - 2*b[2])/2, b[2], (b[1] + 4*b[2])/2}, {-b[1] - 3*b[2], -b[2], b[1]/2, b[1]/2}, {-2*b[2], -b[1] - b[2], (b[1] + 4*b[2])/2, b[1]/2 + b[2]}, {-1/2*b[1] - 2*b[2], -1/2*b[1], -1/2*b[1] - 2*b[2], b[1]/2}, {-1/2*b[1] - 3*b[2], -1/2*b[1], -1/2*b[1] - b[2], -1/2*b[1]}}