Ko
(
コ
)
tsu
(
ツ
)
Ko
(
コ
)
tsu
(
ツ
)
App Store
Google Play
Vocabulary
N4
Day 3
億
New
億
億
おく
hundred million
noun
Sino-Japanese
Lv.2
Again
1
Hard
2
Good
3
Easy
4
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