7 9 6 2
4 2 1 3
6 1
7 6 3 9
9 4
4 8 2 3
5 6
6 5 7 2
3 4 9 8
20-02-2021.......difficile 20-02-2021
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7 3 1 9 5 6 8 4 2
5 4 9 2 8 1 7 3 6
8 2 6 3 7 4 1 9 5
2 5 7 6 4 3 9 8 1
9 8 3 7 1 5 2 6 4
6 1 4 8 9 2 3 5 7
4 9 5 1 2 8 6 7 3
1 6 8 5 3 7 4 2 9
3 7 2 4 6 9 5 1 8
6=>(6,1) | 6=>(2,9) | 4=>(4,5) | 6=>(5,8) | 5=>(5,6) | 6=>(9,5) | 9=>(6,5) | 4=>(3,6) |

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

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

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

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

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

8=>(5,2) | 3=>(5,3) | 8=>(8,3) |