{−4,4}\{-4,4\}{−4,4}
{−3,3}\{-3,3\}{−3,3}
{−2,2}\{-2,2\}{−2,2}
{−1,1}\{-1,1\}{−1,1}
{−22,22}\{-2 \sqrt{2}, 2 \sqrt{2}\}{−22,22}