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This is a variant of над(nad) which is sometimes used before words beginning with certain consonant clusters such as вс-(vs-), вш-(vš-), вт-(vt-), льв-(lʹv-), льд-(lʹd-), льн-(lʹn-), лб-(lb-), лж-(lž-), мн-(mn-), мх-(mx-), рв-(rv-), рт-(rt-), рж-(rž-), сн-(sn-), фл-(fl-) and others.
References
Vasmer, Max (1964–1973) “над”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress
Vasmer, Max (1964–1973) “надо”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress
Trubachyov, Oleg, editor (1995), “*nadъ”, in Этимологический словарь славянских языков [Etymological dictionary of Slavic languages] (in Russian), numbers 22 (*naděliti – *narodъ), Moscow: Nauka, →ISBN, page 15