i,−i,1,−1i,-i, 1,-1i,−i,1,−1
i,−i,2,−2i,-i, 2,-2i,−i,2,−2
i,−i,3,−3i,-i, 3,-3i,−i,3,−3
1,−1,−2,21,-1,-2,21,−1,−2,2