a-a a-c aaa aac aaf aah aao aar ac- aca acc acf ach aco acr af- afa afc aff afh afo afr aha ahc ahf ahh aho ahr aoa aoc aof aoh aoo aor ar- ara arc arf arh aro arr c-- caa cac caf cah cao car cca ccc ccf cch cco ccr cfa cfc cff cfh cfo cfr ch- cha chc chf chh cho chr co- coa coc cof coh coo cor cra crc crf crh cro crr faa fac faf fah fao far fca fcc fcf fco fcr ffa ffc fff ffh ffo ffr fha fhc fhf fhh fho fhr foa foc fof foh foo for fra frc frf frh fro frr haa hac haf hah hao har hca hcc hcf hch hco hcr hfa hfc hff hfh hfo hfr hha hhc hhf hhh hho hhr hoa hoc hof hoh hoo hor hr- hra hrc hrf hrh hro hrr oaa oac oaf oah oao oar oc- oca occ ocf och oco ocr of- ofa ofc off ofo ofr oha ohc ohf ohh oho ohr oo- ooa ooc oof ooh ooo oor or- ora orc orf orh oro orr ra- raa rac raf rah rao rar rca rcc rcf rch rco rcr rfa rfc rff rfh rfo rfr rh- rha rhc rhf rhh rho rhr roa roc rof roh roo ror rra rrc rrf rrh rrr