1 9 4
6 9 7
1 8 2
8 4 5
5 8 1 4
2 3 6
5 1 8
4 5 3
8 3 6
12-11-2020.......hard 12-11-2020
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8 7 2 3 1 6 9 4 5
6 4 9 7 5 2 8 3 1
1 3 5 4 9 8 7 2 6
3 9 8 6 4 7 1 5 2
5 6 7 8 2 1 3 9 4
4 2 1 5 3 9 6 8 7
9 5 4 1 7 3 2 6 8
2 1 6 9 8 4 5 7 3
7 8 3 2 6 5 4 1 9
8=>(1,1) | 4=>(2,2) | 4=>(3,4) | 8=>(8,5) | 8=>(6,8) | 3=>(7,6) | 8=>(2,7) | 3=>(4,1) |

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

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

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

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

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

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