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operating system▼◼◼◼[UK: ˈɒ.pə.reɪt.ɪŋ ˈsɪ.stəm] [US: ˈɑː.pə.ˌret.ɪŋ ˈsɪ.stəm]
OS▼◼◼◻[UK: əʊz] [US: oʊz]
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