The queues that function as a stack together work on X) and POP(S, Y), where S is purportedly a stack, X is the element to be added to S, and Y is the element discarded from S. Assume that only queues are accessible to ADT's ENQUEUE, DEQUEUE, and EMPTYQUEUE operations. Show how your function operates on a list of items (a, b, and c) that will be used as a stack by the queues Q1 and Q2.

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