a-a a-c aaa aac aaf aam aao aar ac- aca acc acf acm aco acr af- afa afc aff afm afo afr ama amc amf amm amo amr aoa aoc aof aom aoo aor ar- ara arc arf arm aro arr c-- caa cac caf cam cao car cca ccc ccf ccm cco ccr cfa cfc cff cfm cfo cfr cma cmc cmf cmm cmo cmr co- coa coc cof com coo cor cra crc crf crm cro crr faa fac faf fam fao far fca fcc fcf fcm fco fcr ffa ffc fff ffm ffo ffr fma fmc fmf fmm fmo fmr foa foc fof fom foo for fra frc frf frm fro frr m-f m-o m-r maa mac maf mam mao mar mc- mca mcc mcf mcm mco mcr mfa mfc mff mfm mfo mfr mma mmc mmf mmm mmo mmr moa moc mof mom moo mor mra mrc mrf mrm mro mrr oaa oac oaf oam oao oar oc- oca occ ocf ocm oco ocr of- ofa ofc off ofm ofo ofr om- oma omc omf omm omo omr oo- ooa ooc oof oom ooo oor or- ora orc orf orm oro orr ra- raa rac raf ram rao rar rca rcc rcf rcm rco rcr rfa rfc rff rfm rfo rfr rma rmc rmf rmm rmo rmr roa roc rof rom roo ror rra rrc rrf rrm rrr