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0. If the sequence of operations- push (1), push (2), pop, push (1), push (2), pop, pop, pop, push (2), pop, are performed on a stack, the sequence of popped out values are
2, 2, 1, 1, 2
2, 2, 1, 2, 2
2, 1, 2, 2, 1
2, 1, 2, 2, 2
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