1 3
3 7 1 9
9 8 5 7
3 9 8 2
8 4
6 2 5 7
3 4 7 1
6 4 9 2
2 6
28-10-2016.......hard 28-10-2016
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2 7 1 5 9 4 3 6 8
6 3 5 7 8 1 4 9 2
9 8 4 3 2 6 1 5 7
7 5 3 9 4 8 2 1 6
8 2 9 1 6 7 5 3 4
4 1 6 2 3 5 7 8 9
3 4 8 6 5 2 9 7 1
5 6 7 4 1 9 8 2 3
1 9 2 8 7 3 6 4 5
9=>(1,5) | 4=>(3,3) | 1=>(3,7) | 2=>(5,2) | 4=>(9,8) | 4=>(1,6) | 5=>(2,3) | 4=>(2,7) |

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

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

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

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

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

1=>(9,1) | 5=>(8,1) | 5=>(9,9) |