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| # | Name | Comments | Duration | Released |
|---|---|---|---|---|
| 59 | Optimistic Locking (revised) | 135 comments | 8 minutes | Aug 04, 2012 |
| 63 | Model Name in URL (revised) | 85 comments | 9 minutes | Dec 16, 2012 |
| 162 | Tree-Based Navigation (revised) | 93 comments | 10 minutes | Dec 01, 2012 |
| 154 | Polymorphic Association (revised) | 99 comments | 11 minutes | May 19, 2012 |