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