4 6 7 9
8 1
9 3 4 5
3 5 4 9
5 2 8 9
9 1 8 4
7 5
6 1 5 2
13-02-2020.......medium 13-02-2020
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1 5 4 6 7 2 9 8 3
3 7 8 9 5 4 6 2 1
9 6 2 3 8 1 4 5 7
6 3 5 8 4 9 1 7 2
2 8 9 1 6 7 3 4 5
4 1 7 5 2 3 8 9 6
5 9 1 2 3 8 7 6 4
7 2 3 4 9 6 5 1 8
8 4 6 7 1 5 2 3 9
5=>(2,5) | 8=>(3,5) | 3=>(8,3) | 7=>(6,3) | 9=>(5,3) | 5=>(5,9) | 4=>(5,8) | 5=>(7,1) |

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

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

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

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

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

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