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4
x
4
x
x
-4 -3 -2 -1 0 1 2 3 4
y
-4
-3
-2
-1
0
1
2
3
4
x
-4 -3 -2 -1 0 1 2 3 4
y
-4
-3
-2
-1
0
1
2
3
4