return [[ 0, 0, 0, 0, 0, 0, 0 ],
[ 0, 2, 0, 4, -6, -2, -6 ],
[ 0, 4, 0, 8, -12, -4, -12 ],
[ 3, 0, 3, 0, 0, 0, 0 ],
[ 3, 2, 3, 4, -6, -2, -6 ],
[ 3, 4, 3, 8, -12, -4, -12 ]];;