Method List
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#add_first DoublyLinkedList
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#add_last DoublyLinkedList
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#first DoublyLinkedList
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#initialize DoublyLinkedList
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#inspect DoublyLinkedList
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#last DoublyLinkedList
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#list_info DoublyLinkedList
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#method_missing DoublyLinkedList
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#move Array
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#remove_first DoublyLinkedList
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#remove_last DoublyLinkedList
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#size DoublyLinkedList
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#to_a DoublyLinkedList