a-a a-b aaa aab aad aaf aaj aak aao aar aas ab- aba abb abd abf abj abk abo abr abs ad- ada adb add adf adj adk ado adr ads af- afa afb afd aff afj afk afo afr afs aja ajb ajd ajf ajj ajk ajo ajr ajs aka akb akd akj akk ako akr aks aoa aob aod aof aoj aok aoo aor aos ar- ara arb ard arf arj ark aro arr ars as- asa asb asd asf asj ask aso asr ass baa bab bad baf baj bak bao bar bas bba bbb bbd bbf bbk bbo bbr bbs bda bdb bdd bdf bdj bdk bdo bdr bds bfa bfb bfd bff bfj bfo bfr bfs bja bjd bjf bjj bjk bjr bjs bka bkb bkf bkk bko bkr bks boa bob bod bof boj bok boo bor bos bra brb brd brf brj brk bro brr brs bsa bsb bsd bsf bsj bsk bso bsr bss daa dab dad daf daj dak dao dar das dba dbb dbd dbf dbk dbo dbr dbs dda ddb ddd ddf ddk ddo ddr dds dfa dfb dfd dff dfj dfk dfo dfr dfs dj- dja djb djd djf djk djo djs dka dkb dkk dko dkr dks doa dob dod dof doj dok doo dor dos dra drb drd drj drk dro drr drs dsa dsb dsd dsf dsj dsk dso dsr dss faa fab fad faf faj fak fao far fas fba fbb fbd fbf fbk fbo fbr fbs fda fdb fdd fdf fdj fdk fdo fdr fds ffa ffd fff ffk ffo ffr ffs fja fjb fjd fjs fka fkb fkf fkj fkk foa fob fof fok foo for fos fra frb frd frf frj frk fro frr frs fsa fsb fsd fsf fsj fsk fso fsr fss j-d jaa jab jad jaf jaj jak jao jar jas jba jbf jbj jbk jbo jbr jbs jda jdb jdf jdo jdr jds jfa jfb jfd jff jfj jfk jfo jfr jfs jja jjb jjf jjj jjk jjr jjs jka jkb jkk jko jkr jks joa job jod jof joj jok joo jor jos jra jrb jrf jrk jro jrr jrs jsa jsb jsd jsf jsj jsk jso jsr jss ka- kaa kab kad kaf kaj kak kao kar kas kba kbb kbd kbf kbk kbo kbr kbs kda kdb kdf kdk kdo kdr kds kfa kfd kff kfo kfs kjb kjr kjs kkb kkk kkr kks koa kob kod kof kok koo kor kos kra krd krf krk kro krr krs ksa ksb ksd ksf ksk kso ksr kss oaa oab oad oaf oaj oak oao oar oas ob- oba obb obd obf obj obk obo obr obs oda odb odd odf odo odr ods of- ofa ofb ofd off ofo ofr ofs oja ojb ojd ojo ojs oka okb okd okj okk oko okr oks oo- ooa oob ood oof ook ooo oor oos or- ora orb ord orf ork oro orr ors os- osa osb osd osf osj osk oso osr oss ra- raa rab rad raf raj rak rao rar ras rba rbb rbd rbf rbk rbo rbr rbs rda rdb rdd rdf rdj rdo rdr rds rfa rfb rfd rff rfj rfk rfo rfr rfs rja rjf rjk rjr rkb rkf rkk rko rks roa rob rod rof roj rok roo ror ros rra rrb rrd rrf rrk rrr rrs rsa rsb rsd rsf rsj rsk rso rsr rss saa sab sad saf saj sak sao sar sas sba sbb sbd sbf sbj sbk sbo sbr sbs sda sdb sdd sdf sdj sdk sdo sdr sds sfa sfb sfd sff sfj sfk sfo sfr sfs sja sjb sjd sjf sjj sjk sjr sjs sk- ska skb skd skf skj skk sko skr sks soa sob sod sof soj sok soo sor sos sr- sra srb srd srf srj srk sro srr srs ss- ssa ssb ssd ssf ssj ssk sso ssr sss