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Here is a MECHANIC APP using Fault TREES
see if u can FIX the BATTERY
i am at position 1, and the solution is, go to 1.
But, the question topic is traversing a binary tree.
Fact is, the graph is displayed/created in wrong style,
so your "you can" go 3 / go 4 are completely confused.
Please tell your story, and make a story or article
text, not so stupid floods with stupid prolog.