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mobile operating system stresses
euph., op.syst.	мобильная платформа (e.g., Tizen Alex_Odeychuk)
op.syst.	мобильная операционная система (e.g., Android, iOS nytimes.com Alex_Odeychuk); операционная система для мобильных устройств (nytimes.com Alex_Odeychuk)