8 1 4 2
5 3 2 7
2 1 5 7
1 6 4 3 9
7 2
8 5 3 7 6
6 2 8 9
1 6 4 3
7 8 9 6
25-02-2020.......easy 25-02-2020
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7 9 8 6 1 4 2 3 5
5 3 4 2 8 7 9 6 1
6 2 1 3 5 9 7 8 4
1 6 2 7 4 8 3 5 9
9 7 3 5 6 1 4 2 8
8 4 5 9 3 2 1 7 6
3 1 6 4 2 5 8 9 7
2 8 9 1 7 6 5 4 3
4 5 7 8 9 3 6 1 2
9=>(1,2) | 7=>(1,1) | 5=>(1,9) | 8=>(8,2) | 3=>(5,3) | 2=>(4,3) | 9=>(2,7) | 7=>(4,4) |

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

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

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

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

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