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