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необратимое преобразование stresses
data.prot.	irreversible transform; non-reversible transform; non-reversible transformation
math.	irreversible transformation
sec.sys.	irreversible conversion
telecom.	nonreversible transform

необратимое преобразование: 4 phrases in 3 subjects

Data processing	1
Information security and data protection	2
Security systems	1