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истинная причина stresses
gen.	underlying cause (Aly19); deep-rooted cause (Franka_LV); the real reason
busin.	actual reason
Makarov.	the real cause
math.	genuine cause; proper cause; true cause; real cause (действительная)

истинная причина: 8 phrases in 3 subjects

Advertising	2
General	2
Makarov	4