History of question #220799
| When | Who | Action | New State |
|---|---|---|---|
| 2013-02-02 | Ding Zhou | Answer | Answered |
| 2013-02-02 | Gerard Rocher Ros | Comment | Answered |
| 2013-02-03 | Ding Zhou | Answer | Answered |
| 2013-02-03 | Gerard Rocher Ros | Confirm | Solved |
| 2013-05-12 | peter smout | Comment | Solved |
| 2013-05-24 | Yosh | Comment | Solved |
| 2013-05-24 | peter smout | Comment | Solved |
