return [[ 0, 0, 0, 0, 0, 0, 0 ],
[ 0, 3, 0, 0, 0, 0, 0 ],
[ 0, 6, 0, 0, 0, 0, 0 ],
[ 4, 0, 0, 4, 0, 0, 0 ],
[ 4, 3, 0, 4, 0, 0, 0 ],
[ 4, 6, 0, 4, 0, 0, 0 ],
[ 8, 0, 0, 8, 0, 0, 0 ],
[ 8, 3, 0, 8, 0, 0, 0 ],
[ 8, 6, 0, 8, 0, 0, 0 ]];;