Use procedures PUSH(S,X), POP(S,X), PRINT(X) and EMPTY_STACK(S) (as described in illustrative problem 4.1) and TOP_OF_STACK(S), which returns the top element of stack S, to write pseudo codes to i) assign X to the bottom element of stack S, leaving the stack empty; ii) assign X to the bottom element of the stack, leaving the stack unchanged; iii) assign X to the nth element in the stack (from the top), leaving the stack unchanged.

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