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p.r.n. stresses
pharm.	по необходимости (mazurov)
English thesaurus
p.r.n.
abbr.	as the circumstances require (Andrey Truhachev)
abbr., med.	as needed
abbr., med., lat.	pro re nata
med.	as occasion requires (лат. pro re nata; as needed)

p .r.n: 1 phrase in 1 subject

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