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3.2 due October 1

The trickiest thing for me in this section is keeping the terminology straight. I sometimes get paths and walks mixed up, which matters in proofs about cycles.

I find the various names for trees interesting. It is easy to see where many of them came from, but the way they are mixed and matched can be unexpected. The definition of leaf node right after parent and child nodes makes me laugh because it makes me imagine childless people as leaves.

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