return [[ 0, 0, 0, 0 ],
[ 0, 0, 2, 0 ],
[ 0, 0, 4, 0 ],
[ 0, 0, 10, 0 ],
[ 0, 0, 20, 0 ],
[ 25, 25, 1, 0 ],
[ 25, 25, 3, 0 ],
[ 25, 25, 5, 0 ],
[ 25, 25, 15, 0 ],
[ 25, 25, 25, 0 ]];;