Measuring 6 Liters Puzzle

The Puzzle:

Measuring 6 Liters
You are going to mix up some concrete, and in order to get it just right you need exactly 6 liters.

But you only have a 4-liter and a 9-liter bucket.

How can you do this?

(You have an unlimited supply of water from the hose)



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-\./^\./-


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