In the furnace, there is a cauldron with 9 liters of molten tin. During the experiment, it must be added to the elixir in three equal portions of 3 liters each, at fixed time intervals.
You have only three fireproof goblets: 5 liters, 4 liters, and 2 liters capacity.
Goal: Prepare exactly three portions of 3 liters each—one in the cauldron and one in each of two other containers.
You can only pour between the cauldron and goblets. No external source is available.
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