5 4 8 7
4 6
9 7 1 2 4
6 1 3 9
2 6
1 2 5 7
8 4 5 6 7
7 1
1 7 3 8
29-10-2020.......easy 29-10-2020
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6 5 4 9 3 2 8 7 1
1 2 8 4 7 6 5 9 3
9 7 3 5 1 8 6 2 4
7 8 6 1 4 3 9 5 2
2 3 5 8 9 7 4 1 6
4 9 1 2 6 5 7 3 8
8 4 2 3 5 9 1 6 7
3 6 9 7 8 1 2 4 5
5 1 7 6 2 4 3 8 9
6=>(1,1) | 7=>(4,1) | 7=>(2,5) | 8=>(4,2) | 6=>(8,2) | 5=>(3,4) | 8=>(3,6) | 6=>(3,7) |

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

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

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

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

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

9=>(7,6) |