7 4 6 1
9 5 7 3 6
3 9 7
5 6 3 4 2
1 4 3
3 6 9 5 1
6 8 7
1 6 8 2 4
5 1 9 8
18-04-2020.......easy 18-04-2020
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8 2 7 4 9 6 3 1 5
9 4 5 7 3 1 6 2 8
1 3 6 5 8 2 4 9 7
5 7 8 6 1 3 9 4 2
2 1 9 8 4 7 5 3 6
3 6 4 9 2 5 7 8 1
6 8 3 2 5 4 1 7 9
7 9 1 3 6 8 2 5 4
4 5 2 1 7 9 8 6 3
2=>(1,2) | 9=>(1,5) | 1=>(3,1) | 7=>(8,1) | 6=>(3,3) | 1=>(2,6) | 4=>(2,2) | 8=>(2,9) |

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

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

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

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

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