Method List
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#add_node Tree
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#children Node
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#data Tree
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#find Tree
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find_node_by_id Extractor
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get_all_by_keys Extractor
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#has_children? Node
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#has_grandchildren? Node
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#id Node
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#initialize Tree
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#initialize Node
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#initialize NodeNotFound
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#node Node
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#nodes Tree
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#parent_id Node
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#remove_node Tree
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remove_node_and_descendents Pruner
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#values_at Tree