After 5,100 years ago, the standardized impressions placed on clay tokens in ancient Mesopotamia became:

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The standardized impressions placed on clay tokens in ancient Mesopotamia eventually evolved into a writing system known as cuneiform. This system used wedge-shaped marks made on clay tablets to represent different words and concepts, and is considered the first true writing system in the world. It was used for over 3,000 years in Mesopotamia and influenced the development of writing systems in other cultures.

After 5,100 Years Ago, the Standardized Impressions Placed on Clay