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one element in the knowledge tree presented in the Contents window (a single item, topic, concept or task in the collection). You can add new nodes with Add and Insert (Ins) at the bottom of the Contents window, or with options on the Edit submenu of the main menu. If a node does not have children, it is called a leaf. If the node has children, it is called a branch. If a node is used as a container for other nodes, it may also be called a folder. The contents menu provides some operations on entire branches such as: Learn, Review all, Statistics, etc.
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