TreeExtract

TreeExtract[tree,pos] extracts the subtree of tree at the position specified by pos.

TreeExtract[tree,{pos1,pos2,…}] extracts a list of subtrees of tree.

TreeExtract[tree,pos,h] extracts subtrees of tree, applying h to each subtree.

TreeExtract[pos] represents an operator form of TreeExtract that can be applied to a tree.

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