1 6 3 7
6 5 3 4
3 9 6 8
9 2 7 4
7 4 3 6
2 4 5 9
3 9 5 2
8 6 5 1
5 2 7 8
07-12-2019.......easy 07-12-2019
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9 4 8 5 2 1 6 3 7
6 1 5 7 3 8 2 4 9
3 7 2 4 9 6 8 1 5
8 9 6 2 7 3 1 5 4
7 5 4 1 8 9 3 2 6
2 3 1 6 4 5 7 9 8
1 6 3 9 5 7 4 8 2
4 8 9 3 6 2 5 7 1
5 2 7 8 1 4 9 6 3
4=>(1,2) | 5=>(1,4) | 7=>(2,4) | 8=>(2,6) | 9=>(2,9) | 3=>(6,2) | 5=>(5,2) | 5=>(3,9) |

9=>(8,3) | 3=>(4,6) | 5=>(4,8) | 6=>(4,3) | 1=>(4,7) | 1=>(5,4) | 6=>(6,4) | 2=>(5,8) |

9=>(5,6) | 2=>(1,5) | 1=>(9,5) | 7=>(6,7) | 8=>(6,9) | 8=>(7,8) | 2=>(2,7) | 6=>(7,2) |

2=>(8,6) | 7=>(8,8) | 6=>(9,8) | 3=>(9,9) | 8=>(1,3) | 9=>(1,1) | 1=>(7,1) | 8=>(4,1) |

4=>(8,1) | 2=>(3,3) | 1=>(2,2) | 7=>(3,2) | 4=>(3,4) | 1=>(3,8) | 1=>(6,3) | 3=>(8,4) |

8=>(5,5) | 7=>(7,6) | 4=>(9,6) | 4=>(7,7) | 9=>(9,7) |