Should be expanded to include languages like Arabic, which interprets "plural" as three or more, since they have a special class for "dual" (pairs) of nouns. Malay/Indonesian and many other austronesian languages double words to make plurals, such as "laki" -> boy, "laki-laki" -> boys, although indonesians often write this as "laki2", (with a superscript "2").
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