a-a a-c aaa aac aah aak aao aar ac- aca acc ach ack aco acr aha ahc ahh ahk aho ahr aka akc akh akk ako akr aoa aoc aoh aok aoo aor ar- ara arc arh ark aro arr c-- caa cac cah cak cao car cca ccc cch cck cco ccr ch- cha chc chh chk cho chr cka ckc ckh cko co- coa coc coh cok coo cor cra crc crh crk cro crr haa hac hah hak hao har hca hcc hch hck hco hcr hha hhc hhh hhk hho hhr hka hkh hkk hko hkr hoa hoc hoh hok hoo hor hr- hra hrc hrh hrk hro hrr ka- kaa kac kah kak kao kar kca kcc kch kck kcr kha khh khk kho khr kkc kkh kkk kkr koa koc koh kok koo kor kra krc krk kro krr oaa oac oah oak oao oar oc- oca occ och ock oco ocr oha ohc ohh oho ohr oka okc okk oko okr oo- ooa ooc ooh ook ooo oor or- ora orc orh ork oro orr ra- raa rac rah rak rao rar rca rcc rch rco rcr rh- rha rhc rhh rho rhr rkc rkk rko roa roc roh rok roo ror rra rrc rrh rrk rrr