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Find out, why I'm so happy today.

Why Happy

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    $\begingroup$ Congratulations! No small feat :) $\endgroup$
    – ricdesi
    Commented Apr 24, 2017 at 19:01

1 Answer 1

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As already...

shown in the rightmost cell of the second row, for each cell, we need to take the difference of the two cells above it. The resulting configuration is: enter image description here

Now we need to

Take the letters corresponding to the numbers in order, yielding: CELEBRATING MY ONE HUNDRED PUZZLES.
(Note that some numbers are missing: namely, 15,24,27,31,33. I guess we simply ignore them.)

Congratulations!

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