a-a a-t aaa aak aao aas aat aka akk ako aks aoa aok aoo aos aot as- asa ask aso ass ast at- ata ato ats att k-t ka- kaa kak kao kas kat kkk kks kkt koa kok koo kos kot ksa ksk kso kss kst kta ktk kto kts ktt oaa oak oao oas oat oka okk oko oks oo- ooa ook ooo oos oot os- osa osk oso oss ost ot- ota otk oto ots ott saa sak sao sas sat sk- ska skk sko sks skt soa sok soo sos sot ss- ssa ssk sso sss sst sta stk sto sts stt taa tak tao tas tat tka tkk tko tks tkt to- toa tok too tos tot tsa tsk tso tss tst tta ttk tto tts ttt