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Answers and rating deltas for
why does `mutate_all()` function fail when reading an `xlsx` based data frame?
| Author | Votes | Δ |
|---|---|---|
| Stormwalker | 3 | +4.13 |
| Prem | 2 | +0.17 |
| Knackiedoo | 1 | -1.13 |
| Atanas Janackovski | 0 | -3.90 |
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