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English uses many open compound nouns, a large subclass of which, by convention in accepted English orthography, are not closed up (not solidified) and are sometimes optionally hyphenated in attributive position (that is, when functioning as a noun adjunct).
The word grammar is derived from Greek γραμματικὴ τέχνη (grammatikḕ téchnē), which means "art of letters", from γράμμα (grámma), "letter", itself from γράφειν (gráphein), "to draw, to write". [3]