🌐EnglishEnglishNederlandsPortuguêsРусскийفارسی中文EntityQ995671· pop 7· linked from 5 articlesprefix grammarformal grammarAvailable in 7 languages中文РусскийPortuguêsCroatianNederlandsفارسیvia Wikidata sitelinks · CC0ConnectionsSemi-Thue systemEntityregular expressionEntityCategoriesFormal languages