8 4 2 7
5 1 8 4
7 3
8 3 1 6
3 2
6 9 7 4
2 9
8 2 5 7
7 6 4 5
17-12-2010.......easy 17-12-2010
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8 6 1 4 3 2 5 9 7
9 5 3 1 7 8 2 4 6
2 4 7 5 6 9 3 8 1
4 7 8 3 2 1 6 5 9
3 9 5 8 4 6 7 1 2
1 2 6 9 5 7 4 3 8
5 1 2 7 8 3 9 6 4
6 8 4 2 9 5 1 7 3
7 3 9 6 1 4 8 2 5
7=>(2,5) | 2=>(2,7) | 5=>(3,4) | 5=>(5,3) | 7=>(4,2) | 9=>(4,9) | 7=>(7,4) | 6=>(5,6) |

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

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

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

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

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

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