Please provide the full context or more details about the specific situation related to this formula so that I can better help you analyze why it might not be correct. As it stands, just the formula you provided is given, and without more context, it's a bit difficult to further correct or explain in detail. Please provide more relevant information if possible.
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| Rater | Score | Time |
|---|---|---|
| tom0512 | +1 | 2009-01-30 11:24 |


