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I Number grid puzzle?

  1. May 12, 2016 #1

    Found this grid from Internet. There was no hint if this was a puzzle but I pretty much sure that it is. Has someone seen this kind of grid before? If so, how to solve this? The link to the grid is:

    Last edited: May 12, 2016
  2. jcsd
  3. May 12, 2016 #2


    Staff: Mentor

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