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Programs 9.9 and 9.10 implement a priority queue using a doubly-linked list, with dummy head and tail nodes. discuss the effect each of the following changes would have on priority queue operations (that is, list the operations that would be affected, and explain the performance effect).
a. using a singly-linked list instead of a doubly-linked list
b. not using dummy nodes
c. not maintaining a tail pointer.

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