return [[ 0, 0, 0 ],
[ 0, 4, 0 ],
[ 2, 3, 0 ],
[ 2, 7, 0 ],
[ 4, 2, 0 ],
[ 4, 6, 0 ],
[ 6, 1, 0 ],
[ 6, 5, 0 ]];;