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Difficult Operating System

humor., abbr. DOS
Difficult
: 130 phrases in 23 subjects
American usage, not spelling1
Astronomy1
Aviation1
Chemistry2
Economics1
Equestrian sports1
Finances1
General87
Geography1
Government, administration and public services1
Health care1
Human rights activism1
Labor law4
Law3
Life sciences2
Marketing1
Medical4
Metallurgy3
Ornithology1
Packaging1
Politics2
Transport8
Veterinary medicine2

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