inv({{0,0,1,0,0,0,0,0}, {0,0,0,0,0,1,0,0}, {10,0,1,0,0,0,-1000,0}, {0,0,0,10,0,1,0,0}, {0,10,1,0,0,0,0,0}, {0,0,0,0,10,1,0,-1000}, {10,10,1,0,0,0,-1000,-1000}, {0,0,0,10,10,1,-1000,-1000}})