Findings:
- Pink operating system
- Net Operating Loss
- X-OS: eXtreme operating system
- The man behind the operating system
- standing but not operating
- Internetwork Operating System
- batch operating system
- International Union of Operating Engineers
- real-time operating system
- Standard Operating Procedure
- operating profit
- The perfect operating system
- Operating Instructions
- Regional Bell Operating Company
- Bell Operating Company
- operating ratio
- Operating Missions as Nodes on the Internet: IP in Space
- The Operating Theater
- Operating Systems (e2poll)
- Operating Room drama
- Operating Manual for Spaceship Earth
- Windows (operating system)
- Radar operating modes
- Domain Operating System
- Disk Operating System
- fringe operating systems
- Linux-based operating system
- Be Operating System
- M&M's standard operating procedure for bored engineers
- real operating system
- Train Operating Company
- Guardian Operating System
- Operating system
- actual operating system locales
- Toy operating systems
- Unix-like operating systems
- Operating Systems Design and Implementation
- Self-updating operating system
- "operating system" loophole in the GNU GPL
- They forgot to give me the operating system!
- Windows 95 Operating System Components
- Modern Operating Systems
- How an operating system boots
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