Discussion
In Sethi Ullman labelling, a leaf that is the left child is labelled 1 and a leaf that is the right child is labelled 0. What label does an interior node whose children are labelled 2 and 2 receive?
Answer: B
When the two labels are equal the node is labelled one more than either, so two and two give three. When they differ the node takes the larger of the two labels unchanged. Working a small tree by hand is the quickest way to fix the rule in mind.
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