Enigmatic Variations 1534
Six Thieves by Aver
Messages produced are IT IS SAID THAT THE EFFECT OF EATING TOO MUCH LETTUCE IS and CHANGE A CELL TO FINISH SENTENCE, MIX ROW CONTAINING IT; SOPORIFIC ends the quote from The Tale of the FLOPSY BUNNIES.
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A full review of this puzzle can be seen over on fifteensquared.