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извлечь урок stresses
gen.	moralize; draw the moral; learn one's lesson; draw a moral (Anglophile)
idiom.	take a page from someone's book (Andrey Truhachev); use a lesson (Yeldar Azanbayev)
math.	learn a lesson (from)
mil.	draw a lesson
извлечённые уроки
gen.	lessons learnt (Praline); insights (User); lesson learned (Alexey Lebedev)
busin.	learnings (D.Lutoshkin)
OHS	lessons learned (Leonid Dzhepko)

извлечённые уроки: 10 phrases in 4 subjects

Caspian	2
General	6
Makarov	1
Oil and gas	1