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thumb|300px|One of Onfim's schoolwork doodles (no. 200), Self-portrait|depicting himself as a horseman slaying a person.
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thumb|300px|One of Onfim's schoolwork doodles (no. 200), Self-portrait|depicting himself as a horseman slaying a person.
Onfim (; ; ) was a boy who lived in the Russian city of Novgorod in the 13th century, sometime around 1220 or 1260. He left his notes and homework exercises scratched in soft birch bark, which was preserved in the clay soil of Novgorod.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).