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Fill the 5 gallons jug and then pour the 5 gallons of water into a four gallons jug. The 4 gallons left are thrown.

Pour 1 gallon from the 5 gallons jug into the 4 gallons jug. You need 3 gallons more to fill the 4 gallons jug.

Fill again the 5 gallons jug and pour 3 gallons to complete the 4 gallons jug.

There are left 2 gallons of water.

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