Determine whether each of the following is a function.

  -7   -1   -8   2   4   -3
  5   0   9   -9   0   13
This is a function

  0   1   1   -8   -4   -7
  6   1   10   -7   -7   14
This is a function

  0   -3   -2   3   -6   -9
  5   1   10   -7   21   11
This is a function

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