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出典:Wiktionary
Literally "one from thirty"; ūnus (“one”) + dē (“from”) + trīgintā (“thirty”)
ūndētrīgintā (indeclinable)
Although ūndētrīgintā is the usual expression for 29, it is also possible to say vīgintī novem (“twenty-nine”) or novem et vīgintī (“nine かつ twenty”).
undetriginta