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If the third step of an input is "65 daikon 12 Tigris 42 23 florally urinary"
What will be definitely the input?

  • A.
    Tigris 65 daikon 12 42 23 florally urinary
  • B.
    urinary  Tigris 65 daikon 12 42 23 florally
  • C.42 urinary  Tigris 65 daikon 12 23 florally
  • D.Cannot be determined

Answer: D

Correct answer: Cannot be determined

Every step of these machines moves one element to a fixed position and lets the rest close up behind it, so the original positions of the elements still waiting are lost as soon as the first move is made. The process runs one way only: from a later line you can say what will follow but never what came before, because many different inputs produce the same intermediate line. That is why the answer to any “what was the input” question of this kind is that it cannot be determined.

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