7 2 3 9
8 6 7
8 3 9 5 1
8 5 1 3
1 8 7 5
6 2 9 4
8 5 9 3 1
9 7 2
4 1 2 8
01-01-2021.......easy 01-01-2021
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7 2 6 4 1 3 8 5 9
5 1 4 9 8 6 3 7 2
8 3 9 5 7 2 6 1 4
9 7 8 2 5 4 1 6 3
1 4 3 8 6 7 2 9 5
6 5 2 3 9 1 4 8 7
2 8 7 6 4 5 9 3 1
3 9 1 7 2 8 5 4 6
4 6 5 1 3 9 7 2 8
4=>(1,4) | 2=>(7,1) | 5=>(2,1) | 3=>(8,1) | 9=>(4,1) | 6=>(1,3) | 3=>(2,7) | 9=>(2,4) |

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

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

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

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

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