Discussion
Step III of an input is : xerostomia 20 Yemeni Soviet Monomorium 31 74 44
Which of the following is definitely Step I of that input?
Answer: D
Correct answer: Cannot be determined
The same irreversibility applies whether you are asked for the input or for an earlier step. Each move destroys the record of where the moved element used to sit, so working backwards from step III to step I is no more possible than working back to the input - several different step I lines lead to the same step III.
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