An
old chestnut goes like this:
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This wine glass is made from 4
matchsticks (and it has a coin inside to represent an olive or something).
Invert the wine glass such that the olive is outside the upside-down glass, by moving two of the matches.
Answer:
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To flip the glass, move the horizontal match to the right by half its length, and move one of the walls of the glass:
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