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Related Clues:
- Mac platform with versions named after big cats
- Ma Bell invention
- Its versions included Yosemite and El Capitan
- What Macs ran on, until a 2016 renaming
- Venerable operating system
- Alternative to Linux
- Renamed Mac platform
- Operating system from Bell Labs
- Operating system invented at Bell Labs
- Linux predecessor / 1995 historical drama ..
- Longtime operating system
- Education centre supported by variable software system
- Bell Labs development of the 1970s
- It runs on a 52-Down
- Mac platform renamed in 2016