3 7 6 8
4 6 8 5
8 7 2 1
8 3 1 9
9 7 5 1
5 9 4 8
1 2 5 7
5 6 9 3
7 6 4 9
11-09-2017.......easy 11-09-2017
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1 2 9 5 4 3 7 6 8
4 7 6 1 8 9 3 5 2
8 3 5 6 7 2 1 9 4
6 8 2 3 1 5 4 7 9
9 4 7 8 2 6 5 3 1
5 1 3 7 9 4 2 8 6
3 9 1 2 5 8 6 4 7
2 5 8 4 6 7 9 1 3
7 6 4 9 3 1 8 2 5
4=>(1,5) | 1=>(1,1) | 3=>(7,1) | 6=>(4,1) | 2=>(8,1) | 7=>(2,2) | 1=>(2,4) | 2=>(2,9) |

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

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

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

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

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