8 4 9 1
9 2 3 5
7 9 6 3
8 5 9 1
1 8 7 3
4 3 9 6
9 7 5 1
7 4 3 9
5 1 3 2
21-10-2018.......easy 21-10-2018
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8 3 6 5 4 2 7 9 1
9 2 1 3 7 8 4 5 6
4 5 7 9 1 6 3 2 8
2 6 8 4 5 3 9 1 7
1 9 5 8 6 7 2 4 3
7 4 3 2 9 1 6 8 5
3 8 9 7 2 5 1 6 4
6 7 2 1 8 4 5 3 9
5 1 4 6 3 9 8 7 2
3=>(1,2) | 2=>(1,6) | 7=>(1,7) | 3=>(7,1) | 4=>(3,1) | 1=>(2,3) | 5=>(3,2) | 6=>(4,2) |

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

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

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

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

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