One strike against this data structure is that it can contain gaps: observe the empty() node between the nodes labeled 4 and 6. Another strike is that it is resistant to a straightforward notion of breadth and depth. The nodes are labeled 1-6 (skipping an empty node where one might expect a 5) in some sort of order. Is that order breadth-first, depth-first, or arbitrary? The answer depends on whether you consider the trees in forests to be siblings or whether you consider each node of a forest as a binary fork in a tree.
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