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difficile adj.
chem.	schwer

difficiles : 82 phrases in 20 subjects

Agriculture	3
Business	1
Chemistry	3
Coal	1
Cultural studies	1
Economics	6
Equestrian sports	1
Finances	1
General	10
Industry	2
Labor law	8
Law	15
Life sciences	2
Medical	6
Metallurgy	5
Natural resourses and wildlife conservation	2
Packaging	1
Religion	1
Social science	1
Transport	12