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Operating system - Wikipedia
オペレーティングシステム - Wikipedia
オペレーティングシステムとは何か|初心者でもわかるOSの基本 ...
What is an Operating System (OS)? Definition, Types and ...
Operating System (OS) Definition & Examples - Lifewire
What is an Operating System? - How-To Geek
What Is an Operating System (OS)? Types, Functions, and More
Operating system (OS) | Definition, Examples, & Concepts
Computer Basics: Understanding Operating Systems ...
What is an OS? Operating System Definition for Beginners