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In general, how useful is the Stack data structure? If we didnt have the Stack data structure can you think of another way to implement

In general, how useful is the Stack data structure?
If we didnt have the Stack data structure can you think of another way to implement the LIFO (last in first out) concept?
Can the Stack ADT accept/handle null entries? Why or why not?
Why Stack ADT is useful specifically for evaluating arithmetic expressions?

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