5 1 6
3 9 5
2 6 7
2 9 7
9 8 1 4
4 3 5
4 7 8
5 9 3
9 6 2
20-04-2019.......medium 20-04-2019
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7 8 9 5 2 4 3 1 6
4 3 6 9 7 1 2 5 8
5 1 2 3 8 6 7 9 4
2 4 5 1 9 7 6 8 3
3 9 8 2 6 5 1 4 7
6 7 1 4 3 8 9 2 5
1 2 4 7 5 3 8 6 9
8 5 7 6 1 9 4 3 2
9 6 3 8 4 2 5 7 1
5=>(3,1) | 9=>(1,3) | 2=>(7,2) | 5=>(4,3) | 4=>(4,2) | 2=>(5,4) | 5=>(5,6) | 5=>(9,7) |

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

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

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

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

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

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