TAOCP 7.2.2.1 Exercise 408

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Section 7.2.2.1: Dancing Links

Exercise 408. [28] (N. Beluhov.) Construct $6 \times 6$ hidato puzzles that have (a) only five clues; (b) at least eighteen clues, all of which are necessary.

Verified: no
Solve time: 6m58s

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