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macOS release names

A sibling set for 22 agents. Apple's desktop OS ran two consecutive theme eras: big cats (2001-2012), then California place names (2013-present). Big cats for eleven years, then California. When a fleet runs out of cats it is allowed to use where it lives, right up until it lets the calendar pick the version number instead.

1. 1Cheetah
2. 2Puma
3. 3Jaguar
4. 4Panther
5. 5Tiger
6. 6Leopard
7. 7Snow Leopard
8. 8Lion
9. 9Mountain Lion
10. 10Mavericks
11. 11Yosemite
12. 12El Capitan
13. 13Sierra
14. 14High Sierra
15. 15Mojave
16. 16Catalina
17. 17Big Sur
18. 18Monterey
19. 19Ventura
20. 20Sonoma
21. 21Sequoia
22. 22Tahoe

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Order is chronological by release: 10.0 Cheetah through 15 Sequoia, then 26 Tahoe under Apple's 2025 switch to year-based version numbers. Source: MacOS (Wikipedia), linked.