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Suppose the function $f$ is given completely by the next table. $$\begin{array}{|cccccccc|}\hline x& -2& -1& 0& 1& 2& 3& 4\\ y& 0& 1& 0& 2& 3& 5& 4\\ \hline\end{array}$$ Which of the following statements about the domain of the function $f$ is true?