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удостоверять v stresses
gen.	abonar; afirmar; assentar; autenticar; certificar; comprovar; dar fé; portar por fé; ratificar; testemunhar; testificar; atestar (JIZM); documentar (spanishru)
удостоверяться v
gen.	afirmar-se; assegurar-se; averiguar-se

удостоверять: 5 phrases in 2 subjects

Business	1
Law	4