[A]

1. ABORT
2. ABORTED_COMMAND
3. ABORT_TIMEOUT
4. ABRT_ERR
5. ACC_MODE
6. ACK_FIRST
7. ACK_SECOND
8. ADD64
9. AF_INET
10. AF_UNIX
11. AF_UNSPEC
12. AHA1542
13. ALLOW_MEDIUM_REMOVAL
14. ALRMMASK
15. ALT
16. ALTGR
17. ANYINTR
18. ARBITRATE
19. ARG_MAX
20. ARRAY_SIZE