(Assume that you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

Fill the 5g bucket and from this bucket fill the 3g bucket, leaving 2g in the 5g bucket.

Empty the 3g bucket, then transfer the 2g in the 5g bucket into the 3g bucket.

Fill the 5g bucket then pour into the 3g bucket until it’s full. It will only take 1g to fill it. That will leave 4g in the 5g bucket.

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