Discussion
A step of an input is : 94 car 86 window shut 52 31 house
Which of the following is definitely the input?
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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