a-a a-c aaa aac aah aao aar ac- aca acc ach aco acr aha ahc ahh aho ahr aoa aoc aoh aoo aor ar- ara arc arh aro arr c-- caa cac cah cao car cca ccc cch cco ccr ch- cha chc chh cho chr co- coa coc coh coo cor cra crc crh cro crr haa hac hah hao har hca hcc hch hco hcr hha hhc hhh hho hhr hoa hoc hoh hoo hor hr- hra hrc hrh hro hrr oaa oac oah oao oar oc- oca occ och oco ocr oha ohc ohh oho ohr oo- ooa ooc ooh ooo oor or- ora orc orh oro orr ra- raa rac rah rao rar rca rcc rch rco rcr rh- rha rhc rhh rho rhr roa roc roh roo ror rra rrc rrh rrr