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There are 2 hourglasses in front of you.
One hourglass measures 7 minutes, the other one measures 4 minutes.
How do you time 9 minutes by using only these 2 hourglasses?
There are 2 hourglasses in front of you.
One hourglass measures 7 minutes, the other one measures 4 minutes.
How do you time 9 minutes by using only these 2 hourglasses?
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