a-a aaa aad aaf aak aao aar aas ad- ada add adf adk ado adr ads af- afa afd aff afk afo afr afs aka akd akk ako akr aks aoa aod aof aok aoo aor aos ar- ara ard arf ark aro arr ars as- asa asd asf ask aso asr ass daa dad daf dak dao dar das dda ddd ddf ddk ddo ddr dds dfa dfd dff dfk dfo dfr dfs dka dkk dko dkr dks doa dod dof dok doo dor dos dra drd drk dro drr drs dsa dsd dsf dsk dso dsr dss faa fad faf fak fao far fas fda fdd fdf fdk fdo fdr fds ffa ffd fff ffk ffo ffr ffs fka fkf fkk foa fof fok foo for fos fra frd frf frk fro frr frs fsa fsd fsf fsk fso fsr fss ka- kaa kad kaf kak kao kar kas kda kdf kdk kdo kdr kds kfa kfd kff kfo kfs kkk kkr kks koa kod kof kok koo kor kos kra krd krf krk kro krr krs ksa ksd ksf ksk kso ksr kss oaa oad oaf oak oao oar oas oda odd odf odo odr ods of- ofa ofd off ofo ofr ofs oka okd okk oko okr oks oo- ooa ood oof ook ooo oor oos or- ora ord orf ork oro orr ors os- osa osd osf osk oso osr oss ra- raa rad raf rak rao rar ras rda rdd rdf rdo rdr rds rfa rfd rff rfk rfo rfr rfs rkf rkk rko rks roa rod rof rok roo ror ros rra rrd rrf rrk rrr rrs rsa rsd rsf rsk rso rsr rss saa sad saf sak sao sar sas sda sdd sdf sdk sdo sdr sds sfa sfd sff sfk sfo sfr sfs sk- ska skd skf skk sko skr sks soa sod sof sok soo sor sos sr- sra srd srf srk sro srr srs ss- ssa ssd ssf ssk sso ssr sss