4 6 7 9
6 7 3 5
1 4 7 6
8 6 4 3
5 9 2 8
3 1 7 5
6 4 9 7
8 6 1 2
9 7 1 6
03-07-2019.......easy 03-07-2019
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5 3 4 6 2 7 9 1 8
9 6 7 3 1 8 4 5 2
1 2 8 5 4 9 3 7 6
8 9 2 1 6 5 7 4 3
4 7 5 9 3 2 8 6 1
3 1 6 8 7 4 2 9 5
6 4 1 2 9 3 5 8 7
7 8 3 4 5 6 1 2 9
2 5 9 7 8 1 6 3 4
4=>(5,1) | 9=>(2,1) | 8=>(3,3) | 7=>(5,2) | 1=>(7,3) | 2=>(4,3) | 6=>(6,3) | 3=>(8,3) |

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

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

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

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

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