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one-to-one relationship
busin., IT	1:1-Beziehung
comp., MS	1:1-Beziehung (An association between two tables in which the primary key value of each record in the primary table corresponds to the value in the matching field or fields of one, and only one, record in the related table)
IT	eineindeutige Beziehung; umkehrbar eindeutige Beziehung

one-to-one relationship: 4 phrases in 2 subjects

Business	2
Microsoft	2