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B/B Plot
From Sudopedia
A Bivalue/Bilocal Plot is a diagram that shows the strong links between candidates in a Sudoku grid.
Such a diagram is a useful tool to identify chains or loops that can be used to eliminate candidates.
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Reference
- David Eppstein. Nonrepetitive Paths and Cycles in Graphs with Application to Sudoku. arXiv:cs/0507053.
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