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What I must conclude?
That the verb ПРЕВАЛИРОВАТЬ is несовершенный вид but it is bookish (i.e. not used in razgovornaya rech')?

AS always searching in Internet for the nesovershennyi vid of russian verbs.
My favourite dictionary: Словари и энциклопедии на Академике, gave me this answer.

ПРЕВАЛИРОВАТЬ
ПРЕВАЛИРОВАТЬ...