return [[ 0, 0, 0, 0 ],
[ 0, 4, 0, 0 ],
[ 0, 12, 0, 0 ],
[ 7, 0, 0, 0 ],
[ 7, 4, 0, 0 ],
[ 7, 12, 0, 0 ],
[ 14, 0, 0, 0 ],
[ 14, 4, 0, 0 ],
[ 14, 12, 0, 0 ],
[ 21, 0, 0, 0 ],
[ 21, 4, 0, 0 ],
[ 21, 12, 0, 0 ]];;