However, the second participant who was much older than the first one, he was able to reason well and therefore he gave the expected responses. He was able to note that the water held in three containers was equal despite the fact that it reached different levels due to the shapes of the containers and similarly he was able to note that the stick and the string were of equal length.

Having known the first two tests, the third one was neither a challenge, he remembered the sizes and the colors of the balls that had been showed to him earlier.

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