return [[ 0, 0 ],
[ 0, 1 ],
[ 0, 2 ],
[ 0, 3 ],
[ 0, 4 ],
[ 0, 5 ],
[ 0, 6 ],
[ 0, 7 ],
[ 4, 0 ],
[ 4, 1 ],
[ 4, 2 ],
[ 4, 3 ],
[ 4, 4 ],
[ 4, 5 ],
[ 4, 6 ],
[ 4, 7 ]];;