Question: Starting with the element A , the items A , B , C , D , and E are pushed upon a stack. The stack

Starting with the element A

,

the items A

,

,

,

,

and E are pushed upon a stack. The stack is popped four times and each element is inserted into a queue. Then two items are deleted from the queue and pushed back on the stack. Then one item is popped from the stack. What is it

?

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