a-a a-c aaa aac aam aao aar ac- aca acc acm aco acr ama amc amm amo amr aoa aoc aom aoo aor ar- ara arc arm aro arr c-- caa cac cam cao car cca ccc ccm cco ccr cma cmc cmm cmo cmr co- coa coc com coo cor cra crc crm cro crr m-o m-r maa mac mam mao mar mc- mca mcc mcm mco mcr mma mmc mmm mmo mmr moa moc mom moo mor mra mrc mrm mro mrr oaa oac oam oao oar oc- oca occ ocm oco ocr om- oma omc omm omo omr oo- ooa ooc oom ooo oor or- ora orc orm oro orr ra- raa rac ram rao rar rca rcc rcm rco rcr rma rmc rmm rmo rmr roa roc rom roo ror rra rrc rrm rrr