Using a 5 liter bucket and a 3 liter bucket, measure out exactly 4 liters of water. You may fill and empty each bucket as often as you wish using water from the trough. Good luck!
Now, using a 9 liter bucket, a 5 liter bucket, and a 3 liter bucket, measure out exactly 7 liters of water. You may fill and empty each bucket as often as you wish using water from the trough. Good luck!
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