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    $\begingroup$ Both the 4-clue puzzle and 3-clue puzzle have a unique solution, good job! $\endgroup$
    – CrSb0001
    Commented Mar 5 at 18:55
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    $\begingroup$ We're trying for the minimum, right? Not specifically 7-clue. $\endgroup$
    – Dr Xorile
    Commented Mar 5 at 19:01
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    $\begingroup$ Yes, we are trying for the minimum. 7 clues was just my proposed lower bound. $\endgroup$
    – CrSb0001
    Commented Mar 5 at 19:02
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    $\begingroup$ That solution with three is very nice. Good explanation +1 $\endgroup$
    – hexomino
    Commented Mar 5 at 19:39