2 months ago Jon Armstrong

The result:

+---+-----------------------------+------------+
| n | cur_path                    | cur_dest   |
+---+-----------------------------+------------+
| 1 | New York                    | New York   |
| 2 | New York,Boston             | Boston     |
| 2 | New York,Washington         | Washington |
| 3 | New York,Washington,Boston  | Boston     |
| 3 | New York,Washington,Raleigh | Raleigh    |
+---+-----------------------------+------------+