{{1, 0, 0, 1/2, 1, 0, 0, 0, 1/2, 0}, {0, 1, 0, 0, 2, 0, 0, 0, 1, 0}, 
 {0, 0, 1, 0, 0, 0, 2, -1, 0, -1}, {0, 0, 0, 0, 0, 1, 1, 0, -1/2, -1/2}}
