History of question #651187
| When | Who | Action | New State |
|---|---|---|---|
| Christoph Heiniger | Answer | Answered | |
| Bin Cheng | Reopen | Open | |
| Christoph Heiniger | Answer | Answered | |
| Bin Cheng | Reopen | Open | |
| Christoph Heiniger | Answer | Answered | |
| Bin Cheng | Confirm | Solved | |
| Bin Cheng | Reopen | Open | |
| Christoph Heiniger | Answer | Answered | |
| Bin Cheng | Confirm | Solved | |
| Bin Cheng | Confirm | Solved |
