Which mapping is not a function?

1.
-2 -----> -3
-----> 5
-1 -----> 8
6 -----> 9

2.
-6 -----> -3
5 ------^
6 ------> -1
8 ------> 6

3.
-4 ------> -9
3 ------> -5
5 ------> -1
8 ------> 7

4.
-6 ----->
5 -----> -3
6 ----->
8 ----->

1 answer

2.
-6 -----> -3
5 ------^
6 ------> -1
8 ------> 6
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