1 2 4 7
3 9 7 8
4 5 2 1
7 9 6 5
2 1 5 9
5 9 4 2
9 7 1 3
4 6 1 7
8 5 3 4
24-04-2014.......easy 24-04-2014
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6 5 1 2 8 4 7 3 9
2 3 9 7 6 1 5 8 4
4 8 7 3 5 9 6 2 1
7 1 4 8 9 2 3 6 5
8 6 2 1 3 5 9 4 7
5 9 3 6 4 7 8 1 2
9 7 6 4 1 8 2 5 3
3 4 5 9 2 6 1 7 8
1 2 8 5 7 3 4 9 6
1=>(9,1) | 2=>(2,1) | 5=>(1,2) | 7=>(3,3) | 1=>(2,6) | 4=>(2,9) | 5=>(2,7) | 6=>(2,5) |

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

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

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

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

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