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"Nitrogen is an essential element in the air." Practice Lesson
"Nitrogen is an essential element in the air." Practice German lesson
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Number of words and phrases in this lesson:
1
Lesson words:
This lesson has no individual words.
Lesson phrases:
Nitrogen is an essential element in the air.
etc.
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Your current mastery of this lesson:
0
Your current completion of this lesson:
0% (0 out of 1)
