3 6 5 2
9 6 5 2 1
1 4 8 6
6 2 3 7
1 3 4
3 4 9 1
8 2 7 9
5 7 3 6 8
8 3 4 7
09-08-2018.......easy 09-08-2018
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7 3 6 5 2 1 8 4 9
4 9 8 3 7 6 5 2 1
2 1 5 4 9 8 7 3 6
9 6 2 8 1 4 3 5 7
1 8 7 9 3 5 2 6 4
3 5 4 7 6 2 9 1 8
8 4 1 2 5 7 6 9 3
5 7 3 6 4 9 1 8 2
6 2 9 1 8 3 4 7 5
1=>(1,6) | 4=>(1,8) | 9=>(4,1) | 6=>(9,1) | 2=>(3,1) | 5=>(3,3) | 8=>(2,3) | 3=>(2,4) |

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

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

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

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

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