| >>> visited
|
| [[False, False, False], [False, False, False], [False, False, False]]
|
| >>> visited[1][0] = True
|
| >>> visited
|
| [[True, False, False], [True, False, False], [True, False, False]]
|
| >>> visited
|
| [[False, False, False], [False, False, False], [False, False, False]]
|
| >>> visited[1][0] = True
|
| >>> visited
|
| [[True, False, False], [True, False, False], [True, False, False]]
|