Haruhi-sama gave us a hard problem...
The Haruhi problem is to find the shortest string containing all permutations of \( n \) symbols. If \( n = 2 \), then the Haruhi problem is easy: the shortest string is "121" or "212". However, if \( n \geq 3 \), then the problem is messy.
See also:
Superpermutation - Wikipedia.
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