a-a a-c aaa aac aaf aah aao aar aas ac- aca acc acf ach aco acr acs af- afa afc aff afh afo afr afs aha ahc ahf ahh aho ahr ahs aoa aoc aof aoh aoo aor aos ar- ara arc arf arh aro arr ars as- asa asc asf ash aso asr ass c-- caa cac caf cah cao car cas cca ccc ccf cch cco ccr ccs cfa cfc cff cfh cfo cfr cfs ch- cha chc chf chh cho chr chs co- coa coc cof coh coo cor cos cra crc crf crh cro crr crs csa csc csf csh cso csr css faa fac faf fah fao far fas fca fcc fcf fco fcr fcs ffa ffc fff ffh ffo ffr ffs fha fhc fhf fhh fho fhr fhs foa foc fof foh foo for fos fra frc frf frh fro frr frs fsa fsc fsf fsh fso fsr fss haa hac haf hah hao har has hca hcc hcf hch hco hcr hcs hfa hfc hff hfh hfo hfr hfs hha hhc hhf hhh hho hhr hhs hoa hoc hof hoh hoo hor hos hr- hra hrc hrf hrh hro hrr hrs hsa hsc hsf hsh hsr hss oaa oac oaf oah oao oar oas oc- oca occ ocf och oco ocr ocs of- ofa ofc off ofo ofr ofs oha ohc ohf ohh oho ohr ohs oo- ooa ooc oof ooh ooo oor oos or- ora orc orf orh oro orr ors os- osa osc osf osh oso osr oss ra- raa rac raf rah rao rar ras rca rcc rcf rch rco rcr rcs rfa rfc rff rfh rfo rfr rfs rh- rha rhc rhf rhh rho rhr rhs roa roc rof roh roo ror ros rra rrc rrf rrh rrr rrs rsa rsc rsf rsh rso rsr rss saa sac saf sah sao sar sas sca scc scf sch sco scr scs sfa sfc sff sfh sfo sfr sfs sh- sha shc shf shh sho shr shs soa soc sof soh soo sor sos sr- sra src srf srh sro srr srs ss- ssa ssc ssf ssh sso ssr sss