6 9 3 5
6 7
2 8 3 1 4
5 8 3 7
1 5
2 5 4 1
3 7 6 9 8
3 8
5 4 2 6
24-12-2019.......easy 24-12-2019
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4 6 9 2 8 1 3 5 7
5 1 3 6 4 7 8 2 9
2 8 7 9 3 5 6 1 4
6 9 5 8 1 3 7 4 2
1 4 8 7 2 6 9 3 5
7 3 2 5 9 4 1 8 6
3 7 1 4 6 2 5 9 8
9 2 6 3 5 8 4 7 1
8 5 4 1 7 9 2 6 3
8=>(1,5) | 5=>(2,1) | 7=>(3,3) | 2=>(8,2) | 9=>(3,4) | 5=>(3,6) | 6=>(3,7) | 1=>(7,3) |

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

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

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

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

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

2=>(5,5) |