return [[ 0, 0, 0, 0 ],
[ 0, 4, 0, 0 ],
[ 0, 8, 0, 0 ],
[ 0, 12, 0, 0 ],
[ 0, 24, 0, 0 ],
[ 9, 0, 0, 0 ],
[ 9, 4, 0, 0 ],
[ 9, 8, 0, 0 ],
[ 9, 12, 0, 0 ],
[ 9, 24, 0, 0 ],
[ 18, 0, 0, 0 ],
[ 18, 4, 0, 0 ],
[ 18, 8, 0, 0 ],
[ 18, 12, 0, 0 ],
[ 18, 24, 0, 0 ],
[ 27, 0, 0, 0 ],
[ 27, 4, 0, 0 ],
[ 27, 8, 0, 0 ],
[ 27, 12, 0, 0 ],
[ 27, 24, 0, 0 ]];;