8 2 1
3 1 9 4
4 8 6
7 5 9 3
8 7
9 1 2 8
1 6 3
7 3 4 8
3 9 1
10-04-2018.......easy 10-04-2018
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8 6 9 2 4 1 3 7 5
3 1 2 6 5 7 8 9 4
5 4 7 9 8 3 6 1 2
6 7 4 5 9 8 1 2 3
1 2 8 4 3 6 7 5 9
9 5 3 7 1 2 4 8 6
2 9 1 8 6 4 5 3 7
7 3 6 1 2 5 9 4 8
4 8 5 3 7 9 2 6 1
4=>(1,5) | 8=>(2,7) | 9=>(3,4) | 1=>(3,8) | 3=>(3,6) | 3=>(6,3) | 3=>(1,7) | 8=>(4,6) |

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

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

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

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

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

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