{{b[1], b[2], b[2], b[1] - 4*b[2]}, {-b[1], 2*b[2], 2*b[2], b[1] - 6*b[2]}, {-b[2], -b[2], (b[1] + 5*b[2])/2, (3*(b[1] - 3*b[2]))/2}, {-2*b[2], -2*b[2], (-b[1] + 3*b[2])/2, (b[1] - 7*b[2])/2}, {(-b[1] - 5*b[2])/2, (b[1] - 3*b[2])/2, (b[1] - 5*b[2])/2, (b[1] - 5*b[2])/2}, {(-b[1] + 5*b[2])/2, (-b[1] + 5*b[2])/2, (b[1] - 9*b[2])/2, (b[1] - 9*b[2])/2}, {(-3*(b[1] - 3*b[2]))/2, (-b[1] + 9*b[2])/2, (-b[1] + 9*b[2])/2, (3*b[1] - 17*b[2])/2}, {-b[1] + 4*b[2], -b[1] + 6*b[2], (-b[1] + 7*b[2])/2, (-3*b[1] + 17*b[2])/2}}