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

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

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

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

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

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