8 7 4 9
4 5 3
3 5 4 6 8
5 6 1
5 8 6 7 3 2
9 3 2
4 8 9 1 6
6 7 4
1 2 4 7
30-08-2017.......easy 30-08-2017
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8 6 7 3 2 1 5 4 9
2 9 1 4 5 8 6 7 3
3 5 4 7 6 9 1 2 8
7 4 2 5 9 3 8 6 1
5 1 8 6 4 7 3 9 2
9 3 6 8 1 2 7 5 4
4 7 3 2 8 5 9 1 6
6 8 9 1 7 4 2 3 5
1 2 5 9 3 6 4 8 7
5=>(1,7) | 2=>(2,1) | 7=>(4,1) | 8=>(2,6) | 7=>(7,2) | 8=>(8,2) | 7=>(3,4) | 2=>(4,3) |

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

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

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

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

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