-al -ol a-a a-b aaa aab aad aak aal aao aar aas ab- aba abb abd abk abl abo abr abs ad- ada adb add adk adl ado adr ads aka akb akd akk akl ako akr aks al- ala alb ald alk all alo alr als aoa aob aod aok aol aoo aor aos ar- ara arb ard ark arl aro arr ars as- asa asb asd ask asl aso asr ass baa bab bad bak bal bao bar bas bba bbb bbd bbk bbl bbo bbr bbs bda bdb bdd bdk bdl bdo bdr bds bka bkb bkk bkl bko bkr bks bla blb bld blk bll blo blr bls boa bob bod bok bol boo bor bos bra brb brd brk brl bro brr brs bsa bsb bsd bsk bsl bso bsr bss daa dab dad dak dal dao dar das dba dbb dbd dbk dbl dbo dbr dbs dda ddb ddd ddk ddl ddo ddr dds dka dkb dkk dkl dko dkr dks dl- dla dlb dld dlk dll dlo dlr dls doa dob dod dok dol doo dor dos dra drb drd drk drl dro drr drs dsa dsb dsd dsk dsl dso dsr dss ka- kaa kab kad kak kal kao kar kas kba kbb kbd kbk kbl kbo kbr kbs kda kdb kdk kdl kdo kdr kds kkb kkk kkl kkr kks kl- kla klb kld klo klr kls koa kob kod kok kol koo kor kos kra krd krk krl kro krr krs ksa ksb ksd ksk ksl kso ksr kss la- laa lab lad lak lal lao lar las lba lbb lbd lbk lbl lbo lbr lbs lda ldb ldd ldk ldl ldo ldr lds lka lkb lkl lkr lks lla llb lld llk lll llo llr lls loa lob lod lok lol loo lor los lra lrb lrd lrk lro lrr lrs lsa lsb lsd lsk lsl lso lsr lss oaa oab oad oak oal oao oar oas ob- oba obb obd obk obl obo obr obs oda odb odd odl odo odr ods oka okb okd okk okl oko okr oks ola olb old olk oll olo ols oo- ooa oob ood ook ool ooo oor oos or- ora orb ord ork orl oro orr ors os- osa osb osd osk osl oso osr oss ra- raa rab rad rak ral rao rar ras rba rbb rbd rbk rbl rbo rbr rbs rda rdb rdd rdl rdo rdr rds rkb rkk rko rks rla rld rll rlo rlr rls roa rob rod rok rol roo ror ros rra rrb rrd rrk rrl rrr rrs rsa rsb rsd rsk rsl rso rsr rss saa sab sad sak sal sao sar sas sba sbb sbd sbk sbl sbo sbr sbs sda sdb sdd sdk sdl sdo sdr sds sk- ska skb skd skk skl sko skr sks sla slb sld slk sll slo slr sls soa sob sod sok sol soo sor sos sr- sra srb srd srk srl sro srr srs ss- ssa ssb ssd ssk ssl sso ssr sss