Mathematics of Sudoku - Wikipedia
Sudoku 4x4 Puzzle 2
W6Z(27)(178)5(18)(17)(15)6W(178)W(578)W4923(127)(125)8W9W(357)W(357)(17)468(129)(1239)W5W4W6(13)(19)76(49)(379)Z(278)W1Z(278)(348)(89)55(14)(17)W3W9W(78)(148)6236(59)4(58)127(89)47(29)6(238)(2389)5(18)(189)(12)8(1259)(27)(257)(2579)634 "Techniques: Double Pairs - Sudoku Of The Day")
Techniques: Double Pairs - Sudoku Of The Day
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