Question: data structures Consider an initially-empty stack S and the sequence of operations push(S,4),push(S,19),pop(S),push(S,2),pop(S),pop(S),push(S,9). Illustrate the result of each operation (clearly indicate the content of the

data structures
Consider an initially-empty stack S and the sequence of operations push(S,4),push(S,19),pop(S),push(S,2),pop(S),pop(S),push(S,9). Illustrate the result of each operation (clearly indicate the content of the stack after the operation and, in case of a pop, the value returned by the operation)
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