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2a) In a sequentially-linked structure, when and why would you use a tail pointer? When and why would you use a header node? What is

2a) In a sequentially-linked structure, when and why would you use a tail pointer? When and why would you use a header node? What is one situation when you would use a symmetricallylinked structure? [3] 2b) What is an abstract data type? What is a data structure? How are they related?

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