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0. Using Pop(S1, Item) Push(S1, Item) Read(Item) Print(Item) the variables S1 represents (stack) and Item is given the input file: A,B,C,D,E,F Which stacks are possible:
5 A 4 B 3 C 2 D 1 E
5 4 3 D 2 A 1 F
5 4 3 F 2 D 1 B
5 4 3 C 2 E 1 B
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