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Comparable to botany species, there exist many different kinds of tree graphs, with different branching structures and node contents. For example, in a binary tree the non-leaf nodes always have exactly two subtrees and in a ternary tree they have exactly three subtrees. Each kind of tree has its own class of algorithms to construct trees, traverse trees, and look up information; its own use and own behaviour. 
% [_data_tree_biology_](http://pipelines.local:9001/p/data_tree_biology)