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出典:Wiktionary
Literally "one from forty"; ūnus (“one”) + dē (“from”) + quadrāgintā (“forty”)
ūndēquadrāgintā (indeclinable)
Although ūndēquadrāgintā is the usual expression for 39, it is also possible to say trīgintā novem (“thirty-nine”) or novem et trīgintā (“nine かつ thirty”).
undequadraginta