Adding nodes to or removing nodes from a linked chain requires a special case when the operation is at the beginning of the chain. To eliminate the special case, you can add a dummy node at the beginning of the chain. The dummy node is always present but does not contain a list entry. The chain, then, is never empty, and so the head reference is never null, even when the list is empty. Modify the class LList, as presented in this chapter, by adding a dummy node to the chain.
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