Ko
(
コ
)
tsu
(
ツ
)
Ko
(
コ
)
tsu
(
ツ
)
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Vocabulary
Non-JLPT
Day 132
窒素
New
窒素
窒素
ちっそ
nitrogen
noun
Sino-Japanese
Lv.5
Again
1
Hard
2
Good
3
Easy
4
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