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this one is a classic : you got 2 containers, one 5L the other 3L. To achieve your objective, you need to precisely fill a recipient tank with 4L of water.... how do you do that ? You can fill, empty and tranfer water in both of the containers (excess water remains in the original container in case of trasnfering 5 into 3...) ! ----- another one here : 1,1,2,3,5,8,13, ?