1 5 9 2
6 5 2 4
2 4 6 3
3 4 1 8 5
6 7
7 5 8 3 2
7 2 6 1
6 1 8 9
6 9 3 5
22-05-2020.......easy 22-05-2020
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8 7 1 3 5 9 2 4 6
6 5 3 2 7 4 1 9 8
9 2 4 1 6 8 3 5 7
3 4 9 7 1 2 8 6 5
2 6 8 5 9 3 4 7 1
7 1 5 4 8 6 9 3 2
4 9 7 8 2 5 6 1 3
5 3 2 6 4 1 7 8 9
1 8 6 9 3 7 5 2 4
8=>(1,1) | 7=>(1,2) | 3=>(2,3) | 7=>(2,5) | 9=>(2,8) | 3=>(8,2) | 1=>(3,4) | 3=>(1,4) |

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

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

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

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

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