Grouped Self-Constraint
Grouped Self-Constraint: Strong and weak links alternate along a chain, and its ends force a conclusion.
How it works on this board
If candidate 5 were false, following the chain around would make the same 5 true
3
8
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5
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9
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8
1
5
1
7
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8
1
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9
8
5
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1
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3
9
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