-er a-a a-b aaa aab aae aaj aak aao aar aas aav ab- aba abb abe abj abk abo abr abs abv aea aeb aee aej aek aeo aer aes aev aja ajb aje ajj ajk ajo ajr ajs aka akb ake akj akk ako akr aks akv aoa aob aoe aoj aok aoo aor aos aov ar- ara arb are arj ark aro arr ars arv as- asa asb ase asj ask aso asr ass asv av- ava avb ave avk avo avr avs baa bab bae baj bak bao bar bas bav bba bbb bbe bbk bbo bbr bbs be- bea beb bee bek beo ber bes bev bja bjj bjk bjr bjs bka bkb bke bkk bko bkr bks bkv boa bob boe boj bok boo bor bos bov bra brb bre brj brk bro brr brs brv bsa bsb bse bsj bsk bso bsr bss bsv bva bvb bve bvk bvo bvr bvs bvv eaa eab eae eaj eak eao ear eas eav eba ebb ebe ebj ebk ebo ebr ebs ebv eea eeb eee eek eeo eer ees eev eja ejo eka ekb eke eko ekr eks ekv eo- eoa eob eoe eok eoo eor eos era erb ere erk ero err ers erv es- esa esb ese esk eso esr ess esv eva evb eve evo evr evs evv jaa jab jae jaj jak jao jar jas jav jba jbj jbk jbo jbr jbs jea jeb jee jej jek jeo jer jes jja jjb jjj jjk jjr jjs jka jkb jkk jko jkr jks jkv joa job joe joj jok joo jor jos jra jrb jrk jro jrr jrs jsa jsb jse jsj jsk jso jsr jss jsv jvb jvs ka- kaa kab kae kaj kak kao kar kas kav kba kbb kbe kbk kbo kbr kbs ke- kea keb kee kek keo ker kes kev kjb kje kjr kjs kkb kke kkk kkr kks kkv koa kob koe kok koo kor kos kra krk kro krr krs krv ksa ksb kse ksk kso ksr kss ksv kva kvb kvk kvo kvr kvs kvv oaa oab oae oaj oak oao oar oas oav ob- oba obb obe obj obk obo obr obs obv oea oeb oee oeo oer oes oja ojb oje ojo ojs oka okb oke okj okk oko okr oks oo- ooa oob ook ooo oor oos oov or- ora orb ore ork oro orr ors orv os- osa osb ose osj osk oso osr oss osv ov- ova ovb ove ovo ovs ovv ra- raa rab rae raj rak rao rar ras rav rba rbb rbe rbk rbo rbr rbs re- rea reb ree rek reo rer res rev rja rjk rjr rkb rke rkk rko rks rkv roa rob roe roj rok roo ror ros rov rra rrb rrk rrr rrs rsa rsb rse rsj rsk rso rsr rss rsv rva rvb rve rvo rvr rvs rvv saa sab sae saj sak sao sar sas sav sba sbb sbe sbj sbk sbo sbr sbs sbv se- sea seb see sej sek seo ser ses sev sja sjb sje sjj sjk sjr sjs sk- ska skb ske skj skk sko skr sks soa sob soe soj sok soo sor sos sov sr- sra srb sre srj srk sro srr srs srv ss- ssa ssb sse ssj ssk sso ssr sss ssv sva svb sve svk svo svr svs svv v-a v-e vaa vab vae vaj vak vao var vas vav vba vbk vbo vbr vbs vbv vea veb vee vek veo ver ves vja vjs vka vkb voa vob voe vok voo vor vos vov vra vrb vre vrk vrr vrs vsa vsb vse vsk vso vsr vss vsv vva vvb vvo vvr vvs vvv