return [[ 0, 0, 0, 0 ],
[ 0, 0, 4, 0 ],
[ 0, 0, 8, 0 ],
[ 0, 0, 12, 0 ],
[ 0, 0, 16, 0 ],
[ 0, 0, 20, 0 ],
[ 0, 0, 24, 0 ],
[ 0, 0, 28, 0 ],
[ 8, 8, 1, 0 ],
[ 8, 8, 5, 0 ],
[ 16, 16, 2, 0 ],
[ 16, 16, 6, 0 ],
[ 16, 16, 10, 0 ],
[ 16, 16, 14, 0 ],
[ 24, 24, 3, 0 ],
[ 24, 24, 7, 0 ]];;