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| $x$ | $10$ | $11$ | $12$ | $13$ |
|---|---|---|---|---|
| $f$ | $6$ | $12$ | $18$ | $12$ |
| $x_i$ | $3$ | $4$ | $5$ | $8$ | $10$ | $11$ |
|---|---|---|---|---|---|---|
| $f_i$ | $\alpha+2$ | $(\alpha-1)^2$ | $4$ | $\alpha-1$ | $2$ | $\alpha$ |
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