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Very hard Sudoku 35 solved by linked locked digit pair analysis
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Locked Candidates Type II (Claiming) / Sudoku Tutorial #7 - YouTube
SudokuWiki.org - Remote Pairs
Very Hard Sudoku level 4 Game 24: Linked locked digit chain test
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JSudoku - XY-Chains, Loops & Almost Locked Sets
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SudokuWiki.org - Almost Locked Sets
Sudoku Assistant -- Solving Techniques
HoDoKu: Solving Techniques - Naked Subsets (Naked Pair, Naked Triple, Naked Quadruple, Locked Pair, Locked Triple)
