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Jan
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Colorless green ideas sleep furiously

Colorless green ideas sleep furiously is a sentence composed by Noam Chomsky in 1957 as an example of a sentence with correct grammar (logical form) but semantics that are nonsensical. The sentence therefore has no understandable meaning. An example of a category mistake, it was used to show inadequacy of the then-popular probabilistic models of grammar, and the need for more structured models. (via sleevia)