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Answers and rating deltas for
Why instance variable is null in below example
| Author | Votes | Δ |
|---|---|---|
| ritesht93 | 4 | +0.76 |
| Dominic B. | 1 | +1.22 |
| Petro Ryndych | 1 | +1.75 |
| Sumon Mal | 0 | -2.19 |
| Preuk | 0 | -2.31 |
| Lutz Horn | 0 | -0.56 |
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