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In this short video .I explain what these patterns are, and how they work to eliminate small numbers.
NOTE In an XY wing each cell must have 2 small numbers (bivalue cells)
NOTE The 3 cells in an XY wing must have a 3X3 .e.i. each cell must have 2 out of the 3 small number which make up a 3X3 e.g. 34, 46, 36
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