Discussion
Below is given the third step of an input.What will be its second step? Step III : 387 42 236 185 92 64
Answer: D
Correct answer: Cannot be determined
Working forward from a given line is always possible, but working backward is not: each move slides an element out of its old place and lets the rest close up, so the earlier arrangement cannot be recovered. Several different second steps would produce the same third step, and nothing in the line distinguishes them.
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