5 7 3 4
6 5 3 9
4 9 8 5
1 7 4 9
6 7 3 1
8 1 6 5
3 7 9 2
7 9 2 4
6 1 7 3
11-02-2019.......easy 11-02-2019
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5 9 7 3 1 6 4 8 2
8 6 2 5 4 7 3 1 9
1 4 3 9 2 8 6 5 7
3 5 1 2 7 4 9 6 8
6 7 4 8 9 5 2 3 1
9 2 8 1 6 3 5 7 4
4 3 5 7 8 9 1 2 6
7 1 9 6 3 2 8 4 5
2 8 6 4 5 1 7 9 3
6=>(1,6) | 9=>(1,2) | 9=>(6,1) | 2=>(2,3) | 4=>(2,5) | 7=>(2,6) | 7=>(3,9) | 3=>(3,3) |

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

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

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

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

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