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προαιρετικός m
commun.	optional
comp., MS	optional (Pertaining to a component, parameter and so on that is not required or automatic)
med.	facultative
NT:προαιρετικός m
fin., commun., IT	mandatory

προαιρετικός: 7 phrases in 4 subjects

Economy	3
Law	2
Pharmacy and pharmacology	1
Social science	1