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In Ruby, in the context of a class method, what are instance and class variables?
| Author | Votes | Δ |
|---|---|---|
| user253455 | 4 | +2.72 |
| JRL | 4 | +0.34 |
| Petros | 1 | -1.49 |
| Wojciech Kaczmarek | 0 | -3.95 |
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