| pk1 | pk2 | pk3 | content |
|---|---|---|---|
| b | f | a | b-f-a |
| b | f | b | b-f-b |
| b | f | c | b-f-c |
| b | f | d | b-f-d |
| b | f | e | b-f-e |
| b | f | f | b-f-f |
| b | f | g | b-f-g |
| b | f | h | b-f-h |
| b | f | i | b-f-i |
| b | f | j | b-f-j |
| b | f | k | b-f-k |
| b | f | l | b-f-l |
| b | f | m | b-f-m |
| b | f | n | b-f-n |
| b | f | o | b-f-o |
| b | f | p | b-f-p |
| b | f | q | b-f-q |
| b | f | r | b-f-r |
| b | f | s | b-f-s |
| b | f | t | b-f-t |
| b | f | u | b-f-u |
| b | f | v | b-f-v |
| b | f | w | b-f-w |
| b | f | x | b-f-x |
| b | f | y | b-f-y |
| b | f | z | b-f-z |