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There're 5 elements a,b,c,d,e

[不定项选择题]
There're 5 elements a,b,c,d,e to be pushed into a Stack in the alphabetical order, which one(s) below is(are) the possible pop up sequence?
  • a,b,c,d,e
  • e,d,c,b,a
  • c,b,d,a,e
  • c,a,b,d,e

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