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  2. Colorless green ideas sleep furiously - Wikipedia

    en.wikipedia.org/wiki/Colorless_green_ideas...

    Approximate X-bar representation of Colorless green ideas sleep furiously.See phrase structure rules.. Colorless green ideas sleep furiously was composed by Noam Chomsky in his 1957 book Syntactic Structures as an example of a sentence that is grammatically well-formed, but semantically nonsensical.