return [[ 0, 0, 0, 0 ],
[ 0, 2, 0, 0 ],
[ 0, 4, 0, 0 ],
[ 0, 10, 0, 0 ],
[ 0, 20, 0, 0 ],
[ 25, 0, 0, 0 ],
[ 25, 2, 0, 0 ],
[ 25, 4, 0, 0 ],
[ 25, 10, 0, 0 ],
[ 25, 20, 0, 0 ]];;