Node
Properties
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                  Indicates if the node is detached from the structure it was a part of.
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                  Returns node corresponding to the next place from this node's corresponding place. If there is no such node (i.e. this node is the last one), null is returned.
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                  Returns node corresponding to the previous place from this node's corresponding place. If there is no such node (i.e. this node is the first one), null is returned.