1: 8 6 4 2: 9 7 5 3 3: 5 2 4: 10 6 1 5: 6 3 2 6: 10 8 5 4 1 7: 9 2 8: 6 1 9: 7 2 10: 6 4 parent articulation vertex: 2 parent articulation vertex: 5 parent articulation vertex: 6 via bridge non-leaf articulation vertex: 5