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klasa f
gen.	فصل   ؛قاعة
math.	فئة ؛ مجموعة ؛ صنف
klasy n
gen.	فصول

klasa: 76 phrases in 10 subjects

Electric traction	1
Electronics	3
General	1
Isolation	2
Mathematics	16
Microsoft	40
Radio	6
Telecommunications	1
Transformers	2
Vacuum tubes	4