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