a-a a-t aaa aaf aak aas aat af- afa aff afk afs aft aka akk aks as- asa asf ask ass ast at- ata atf ats att faa faf fak fas fat ffa fff ffk ffs fft fka fkf fkk fkt fsa fsf fsk fss fst fta ftf ftk fts ftt k-t ka- kaa kaf kak kas kat kfa kff kfs kkk kks kkt ksa ksf ksk kss kst kta ktf ktk kts ktt saa saf sak sas sat sfa sff sfk sfs sft sk- ska skf skk sks skt ss- ssa ssf ssk sss sst sta stf stk sts stt taa taf tak tas tat tfa tff tfk tfs tft tka tkk tks tkt tsa tsf tsk tss tst tta ttf ttk tts ttt