The procedure is as follows:
f. 
1. Fill the 3 gallon jag and pour as much water as possible into the 5 gallon jug twice. There will be 1 gallon left in the 3 gallon jag
2. Empty the 5 gallon jug.  Pour the 1 gallon water in the 3 gallon jug into it.
3. Fill the 3 gallon jug. Pour all into the 5 gallon jug. There will be 1+3=4 gallons in the 5 gallon jug.
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