You can see the full category hierarchy on the Category Map.
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| 2 beginning with B  | BLAH BORED IN CLASS  | 
| 2 beginning with E  | EIGENVECTOR EIGENVECTOR (2)  | 
| 3 beginning with F  | FACTS (2) FIRST-YEAR STUDENTS FUNDAMENTALS  | 
| 1 beginning with G  | GEOMETRY | 
| 2 beginning with I  | IDIOT INFURIATED BY SLOW TEACHERS  | 
| 1 beginning with O  | OH, FOR GOD'S SAKE! | 
| 3 beginning with S  | SLEEP (2) SLOW TEACHERS SPANNING TREES  | 
| 2 beginning with T  | TOO SLOW FOR ME TOO SIMPLE  | 
16 apronyms in total | |