return [[ 0, 0, 0, 0 ],
[ 0, 5, 0, 0 ],
[ 0, 10, 0, 0 ],
[ 0, 15, 0, 0 ],
[ 0, 30, 0, 0 ],
[ 9, 0, 0, 0 ],
[ 9, 5, 0, 0 ],
[ 9, 10, 0, 0 ],
[ 9, 15, 0, 0 ],
[ 9, 30, 0, 0 ],
[ 18, 0, 0, 0 ],
[ 18, 5, 0, 0 ],
[ 18, 10, 0, 0 ],
[ 18, 15, 0, 0 ],
[ 18, 30, 0, 0 ]];;