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System software - Wikipedia
系统软件 - 维基百科,自由的百科全书
Software system - Wikipedia
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系统软件 - 维基百科,自由的百科全书 - zh.wikipedia.org
Software - Simple English Wikipedia, the free encyclopedia
Introduction to Computers/System software - Wikiversity
System software | Definition, History, & Facts | Britannica
Category:System software - Wikipedia