How does it work?
RULE
You have to select the alphabetically first node in currently open level.
EXPLANATION
alphabetically first node
when choosing between nodes on the same level, you must choose groups of children in the same order you chose their parents. Within the group choose alphabetically
level
starting node is on level 0, nodes adjacent to starting node are on level 1, nodes adjacent to nodes on level 1 are on level 2...
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Start node End node