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A. p-＞next = rear-＞next-＞next； rear-＞next = p
B. p-＞next = rear-＞next；  rear-＞next-＞next = p
C. p-＞next = rear-＞next-＞next； rear-＞next-＞next = p
D. p-＞next = rear-＞next-＞next； rear-＞next-＞next = p-＞next

A.p = p-＞prior；p-＞prior-＞next = p-＞next
B.p-＞prior-＞next = p；p-＞next = p-＞next-＞prior
C.p-＞next-＞prior = p；p-＞next = p-＞next-＞next
D.p-＞prior-＞next = p-＞next；p-＞next-＞prior = p-＞prior