6 2 1 5
8 5 4 6
3 7
4 2 8 9
2
5 6 8 7
9 3
9 6 3 4
3 1 4 2
21-09-2017.......medium 21-09-2017
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4 6 9 2 8 3 1 5 7
8 2 7 9 5 1 4 3 6
3 1 5 4 7 6 2 8 9
7 4 2 3 1 8 6 9 5
6 9 8 5 2 7 3 4 1
1 5 3 6 4 9 8 7 2
2 8 4 1 9 5 7 6 3
9 7 6 8 3 2 5 1 4
5 3 1 7 6 4 9 2 8
3=>(1,6) | 2=>(7,1) | 1=>(6,1) | 5=>(3,3) | 2=>(2,2) | 3=>(2,8) | 6=>(3,6) | 8=>(3,8) |

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

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

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

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

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

7=>(7,7) | 8=>(7,2) | 5=>(8,7) | 7=>(8,2) |