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необходимое условие stresses
law	condition indispensable (vleonilh); une condition sine qua non (Alex_Odeychuk)
math.	condition nécessaire
необходимое условие indisponsable
gen.	sine qua non (pivoine)
необходимые условия
gen.	impératif m
journ.	conditions nécessaires
polit.	facilités f
tech.	impératifs m

необходимое условие: 14 phrases in 6 subjects

Automated equipment	1
General	4
Law	4
Patents	1
Politics	2
Technology	2