8 4 2 6
4 7 3 9
6 2
8 5 7 4
4 1
9 2 8 5
4 9
1 3 6 5
9 8 4 7
14-07-2019.......medium 14-07-2019
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8 9 1 4 5 2 3 7 6
5 4 2 7 6 3 1 9 8
7 3 6 9 8 1 2 4 5
3 6 8 5 1 7 4 2 9
4 2 5 6 3 9 7 8 1
1 7 9 2 4 8 5 6 3
6 8 4 1 7 5 9 3 2
2 1 7 3 9 6 8 5 4
9 5 3 8 2 4 6 1 7
6=>(2,5) | 8=>(7,2) | 6=>(5,4) | 1=>(7,4) | 9=>(5,6) | 4=>(6,5) | 3=>(6,9) | 9=>(4,9) |

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

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

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

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

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

2=>(2,3) | 5=>(9,2) | 5=>(5,3) |