• Chano
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    So many possibilities! :)
    August 9, 2013, 4:42 pm
  • Matthijs
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    After two invalid answers I gave up. Nice patterns though :)
    August 9, 2013, 9:18 pm
  • margpheb
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    I tried 4 patterns before I gave up.
    August 10, 2013, 8:19 am
  • Chano
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    Hints anyone? lol

    with the remaining 1s.. just make diagonals... going from C4 R9 to C9 R4 and from C7 R12 to R12 C7... and symmetrically :)
    August 10, 2013, 9:12 am
  • jeanvic
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    Thanks for the help, Chano. Too many possibilities for me!
    August 21, 2013, 12:19 am
  • gjenny
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    Thanks, Chano. not the first time your hints have saved me - and i'm sure it won't be the last :)
    August 21, 2013, 12:07 pm