-al -ol a-a a-b aaa aab aad aak aal aao aas ab- aba abb abd abk abl abo abs ad- ada adb add adk adl ado ads aka akb akd akk akl ako aks al- ala alb ald alk all alo als aoa aob aod aok aol aoo aos as- asa asb asd ask asl aso ass baa bab bad bak bal bao bas bba bbb bbd bbk bbl bbo bbs bda bdb bdd bdk bdl bdo bds bka bkb bkk bkl bko bks bla blb bld blk bll blo bls boa bob bod bok bol boo bos bsa bsb bsd bsk bsl bso bss daa dab dad dak dal dao das dba dbb dbd dbk dbl dbo dbs dda ddb ddd ddk ddl ddo dds dka dkb dkk dkl dko dks dl- dla dlb dld dlk dll dlo dls doa dob dod dok dol doo dos dsa dsb dsd dsk dsl dso dss ka- kaa kab kad kak kal kao kas kba kbb kbd kbk kbl kbo kbs kda kdb kdk kdl kdo kds kkb kkk kkl kks kl- kla klb kld klo kls koa kob kod kok kol koo kos ksa ksb ksd ksk ksl kso kss la- laa lab lad lak lal lao las lba lbb lbd lbk lbl lbo lbs lda ldb ldd ldk ldl ldo lds lka lkb lkl lks lla llb lld llk lll llo lls loa lob lod lok lol loo los lsa lsb lsd lsk lsl lso lss oaa oab oad oak oal oao oas ob- oba obb obd obk obl obo obs oda odb odd odl odo ods oka okb okd okk okl oko oks ola olb old olk oll olo ols oo- ooa oob ood ook ool ooo oos os- osa osb osd osk osl oso oss saa sab sad sak sal sao sas sba sbb sbd sbk sbl sbo sbs sda sdb sdd sdk sdl sdo sds sk- ska skb skd skk skl sko sks sla slb sld slk sll slo sls soa sob sod sok sol soo sos ss- ssa ssb ssd ssk ssl sso sss