If \( \xi=\{ \) all digits in our decimal system \( \}, \mathrm{A}=\{x: x \) is prime \( \} \), ...

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If \( \xi=\{ \) all digits in our decimal system \( \}, \mathrm{A}=\{x: x \) is prime \( \} \), and \( \mathrm{B}=\left\{x: x^{2}25\right\} \), then write the following :
\[
A \cup B
\]
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