return [[ 0, 0, 0, 0 ],
[ 0, 3, 0, 0 ],
[ 0, 9, 0, 0 ],
[ 7, 0, 0, 0 ],
[ 7, 3, 0, 0 ],
[ 7, 9, 0, 0 ],
[ 14, 0, 0, 0 ],
[ 14, 3, 0, 0 ],
[ 14, 9, 0, 0 ]];;