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I've tried looking at the paper from different angles, and nothing is jumping out at me. I'm not sure what to try next. 7*8 grid with partially and completely filled squares.

Thanks!

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    $\begingroup$ Looks identical to this page in Martin Gardner book books.google.ca/… $\endgroup$
    – Len
    Commented Jan 30, 2015 at 8:51
  • 2
    $\begingroup$ I saw this in one of my 8th grade geometry textbooks a decade or so ago. $\endgroup$
    – geometrian
    Commented Jan 30, 2015 at 15:26

1 Answer 1

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The answer is:

HELLO - just compress the vertical dimension like this:
enter image description here

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