3 8 9 1
6 1 4 7
5 8
4 6 7 1 2
6 9 5 3 7
4 2
2 5 8 6
1 3 8 9
31-12-2018.......medium 31-12-2018
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7 3 2 8 4 9 6 1 5
8 6 1 2 3 5 4 7 9
5 4 9 7 1 6 3 2 8
9 5 4 6 7 1 2 8 3
1 7 3 4 8 2 9 5 6
2 8 6 9 5 3 7 4 1
4 9 8 5 6 7 1 3 2
3 2 5 1 9 4 8 6 7
6 1 7 3 2 8 5 9 4
4=>(1,5) | 6=>(9,1) | 4=>(3,2) | 8=>(2,1) | 8=>(6,2) | 7=>(9,3) | 2=>(3,8) | 8=>(5,5) |

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

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

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

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

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

7=>(3,4) | 5=>(7,4) | 7=>(7,6) |