| In a directed graph with 6 nodes numbered from 0 to 5: |
| node 0 should be visited before node 3 |
| node 1 should be visited before node 5 |
| node 1 should be visited before node 2 |
| node 1 should be visited before node 0 |
| node 1 should be visited before node 3 |
| node 1 should be visited before node 4 |
| node 2 should be visited before node 0 |
| node 2 should be visited before node 3 |
| node 2 should be visited before node 4 |
| node 5 should be visited before node 2 |
| node 5 should be visited before node 0 |
| node 5 should be visited before node 4. |
