2 8 5 7
9 1 6 3
3 8
1 4 8 2
5 9
4 6 9 3
1 3
3 7 2 5
6 5 1 9
15-07-2018.......easy 15-07-2018
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2 1 8 3 9 4 5 6 7
5 9 7 1 8 6 4 3 2
3 4 6 5 2 7 9 1 8
9 6 1 4 3 8 2 7 5
8 5 3 2 7 1 6 9 4
7 2 4 6 5 9 3 8 1
1 8 2 9 6 5 7 4 3
4 3 9 7 1 2 8 5 6
6 7 5 8 4 3 1 2 9
5=>(2,1) | 7=>(2,3) | 4=>(2,7) | 8=>(2,5) | 3=>(5,3) | 9=>(8,3) | 9=>(3,7) | 3=>(4,5) |

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

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

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

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

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

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