−2≤p≤2-2 \leq p \leq 2−2≤p≤2
−4<p≤4-4<p \leq 4−4<p≤4
−2<p<2-2<\mathrm{p}<2−2<p<2
−4≤p<4-4 \leq p<4−4≤p<4