8 5
2 9 1
4 9 6 7
9 8 5 2 3
6 4 1 3 7
3 4 1 5
1 8 2
6 9
12-11-2017.......medium 12-11-2017
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1 8 3 7 4 6 9 5 2
6 7 2 5 9 8 1 3 4
4 9 5 3 2 1 8 6 7
7 1 9 8 5 2 3 4 6
8 3 4 9 6 7 5 2 1
5 2 6 4 1 3 7 8 9
3 4 8 2 7 9 6 1 5
9 5 1 6 8 4 2 7 3
2 6 7 1 3 5 4 9 8
9=>(8,1) | 1=>(1,1) | 8=>(3,7) | 4=>(5,3) | 2=>(1,9) | 6=>(4,9) | 4=>(4,8) | 9=>(6,9) |

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

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

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

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

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

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