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Related Clues:
- Common Apple platform
- Ken Thompson helped develop it
- System developed at Bell Laboratories
- Mac platform
- Modern Apple platform
- Operating system developed at Bell Labs
- Modern Mac interface
- Operating system that doesn't do Windows?
- Operating system designed by AT&T employees
- Bell Labs invention
- Operating system since the '60s
- System developed at Bell Labs
- Computer operating system since the '60s
- Operating system option
- Basis of the Solaris Operating System