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Professor Provolone's Picto-Puzzle

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Professor Provolone's Picto-Puzzle
Puzzle information
Creator Professor Provolone
Answer PuzzleAnswer
First appearance "Lisa the Simpson"

Professor Provolone's Picto-Puzzle, or simply Picto-Puzzle, is a brain teaser puzzle that Lisa couldn't answer in "Lisa the Simpson." The actual answer was 6.  But this is not correct.  The actual answer is a mirrored 6 backed against a 6.