| | | | | |
BFS (cont.) 
    <- queue
---------
1
2 3 4
3 4 5 6
4 5 6 9 10
5 6 9 10
6 9 10
9 10 8
10 8 7 12
8 7 12 11
7 12 11
12 11
11
    digraph

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