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