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The strategy is to find the two nodes before and after 'data', but the tricky thing here is
that both could be missing, so we add a faked root here before the head.
Inserting a Node Into a Sorted Doubly Linked List
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The strategy is to find the two nodes before and after 'data', but the tricky thing here is that both could be missing, so we add a faked root here before the head.