7 8 4
2 3 8 4 7
6 9 5 8
5 9 2 1
1 4 9
4 7 3 6
3 7 2 9
9 5 1 3 4
2 6 5
30-07-2017.......easy 30-07-2017
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7 5 8 3 2 1 4 6 9
9 2 3 6 8 4 7 5 1
1 6 4 9 7 5 2 8 3
5 9 7 2 3 6 8 1 4
3 8 6 1 4 9 5 2 7
2 4 1 8 5 7 9 3 6
4 3 5 7 6 2 1 9 8
6 7 9 5 1 8 3 4 2
8 1 2 4 9 3 6 7 5
9=>(1,9) | 3=>(5,1) | 9=>(2,1) | 5=>(1,2) | 6=>(2,4) | 5=>(2,8) | 1=>(1,6) | 7=>(3,5) |

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

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

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

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

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