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If a node has no left subtree, then the node has no attributes of type 2. Otherwise, the node has exactly one attribute of type 2 and that attribute equals the left subtree. The timestamp of the attribute equals the server time for which the left subtree was last changed. Attributes of type 2 are referred to as 'left' attributes.
Attribute type 3 is analogous to type 2 but concerns the right subtree of the node. Attributes of type 3 are referred to as 'right' attributes.
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