History of question #680997
| When | Who | Action | New State |
|---|---|---|---|
| Olivier Mattelaer | Answer | Answered | |
| Olivier Mattelaer | Answer | Answered | |
| Olivier Mattelaer | Answer | Answered | |
| Olivier Mattelaer | Answer | Answered | |
| Olivier Mattelaer | Comment | Answered | |
| Shao-Feng Ge | Confirm | Solved |
