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