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code to copy from a stack to a register

This is from a homework question in a textbook that pretty much sucks. I've been unable to find any reference to this action in the chapter the problem is from, and have reached the point of desperation. I'm trying to find the code to copy a particular item from a stack into a separate register.

Specifically the question is:
Register R5 is used in a program to point to the top of a stack. Write a sequence of instructions using the INDEX, AUTOINCREMENT or AUTODECREMENT adressing modes to perform the following:
Copy the 5th item from the top into R3

the textbook I'm using is "Computer Organization, fifth edition" by Hamacher, Vranesic and Zaky.

Any help or direction to different resources would be much appreciated.
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