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"Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo" is a sentence that is grammatically correct in English that is often presented as an example of how homonyms and homophones can be used to create complicated linguistic constructs through lexical ambiguity. It has been discussed in literature in various forms since 1967, when it appeared in Dmitri Borgmann's Beyond Language: Adventures in Word and Thought.

Source: Wikipedia — Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo (CC BY-SA 4.0)