You can see the full category hierarchy on the Category Map.
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| 4 beginning with F  | FORUM POST FORUM POST (2) FORUM POST (3) FORUM POST (4)  | 
| 1 beginning with M  | MESSAGE LIST | 
| 2 beginning with P  | POST A MESSAGE POST A MESSAGE (2)  | 
| 5 beginning with T  | THREAD LIST (5) THREAD LIST (4) THREAD LIST (3) THREAD LIST (2) THREAD LIST  | 
12 apronyms in total | |