[ [ 1,-1,-1, 0,0,0, 0,0,1,0, 0 ],
  [ 0, 0, 0,-1,1,1, 0,0,0,0, 0 ],
  [ 0, 0, 0, 0,0,0,-1,1,0,0, 0 ],
  [ 0, 0, 0, 0,0,0, 0,0,0,1,-1 ] ]