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digit

The ten symbols $0$ , $1$ , $2$ , $3$ , $4$ , $5$ , $6$ , $7$ , $8$ , and $9$ . The number $215$ has three digits: $2$ , $1$ , and $5$ .

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$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$