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by 317070
797 days ago
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What I found: 753
7512
762
7152
34152
3417
357 That's the same as your solution but in reverse. It's not possible in 4 steps or less, because if you ignore the no-duplicates-rule, there is only 1 possibility and that one has duplicates. It's not possible in 5 steps, because you would not end up with an odd length list again. Solutions will always have an even number of steps. So six must be shortest. |
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