| In a directed graph with 7 nodes numbered from 0 to 6: |
| node 0 should be visited before node 6 |
| node 0 should be visited before node 2 |
| node 0 should be visited before node 3 |
| node 0 should be visited before node 5 |
| node 1 should be visited before node 2 |
| node 1 should be visited before node 5 |
| node 2 should be visited before node 5 |
| node 3 should be visited before node 5 |
| node 4 should be visited before node 6 |
| node 4 should be visited before node 1 |
| node 6 should be visited before node 1 |
| node 6 should be visited before node 2 |
| node 6 should be visited before node 3 |
| node 6 should be visited before node 5. |
