A Knuth Binary Tree has none, one or two branches. Figure 2 shows a Knuth Binary Tree. Each node contains two pointers, one pointing to the left subtree and one pointing to the right subtree. A Knuth Tree is easier to implement than a strict binary tree as recursive algorithms can be used. In a Binary Search Tree the values contained in the nodes in the left subtree, child nodes, will all be less than that in the root node. Similarly the values contained in the nodes in the right subtree will all be greater than that in the root node. Trees can be reversed if required by making the left subtrees contain larger values than the root.
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