Fill the 3-liter bucket and pour it into the empty 5-liter bucket .
Fill the 3-liter bucket again, and pour enough to fill 5-liter bucket.
This leaves exactly 1 liter in the 3-liter bucket .
Empty the 5-liter bucket , pour the remaining 1 liter from the 3-liter
bucket into the 5-liter bucket .
Fill the 3-liter bucket and pour it into the 5-liter bucket.
The 5-liter bucket now has exactly 4 liters.
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