-al -ol a-a a-b a-i aaa aab aai aak aal aao aas ab- aba abb abi abk abl abo abs ai- aia aib aii aik ail aio ais aka akb aki akk akl ako aks al- ala alb ali alk all alo als aoa aob aoi aok aol aoo aos as- asa asb asi ask asl aso ass baa bab bai bak bal bao bas bba bbb bbi bbk bbl bbo bbs bi- bia bib bii bik bil bio bis bka bkb bkk bkl bko bks bla blb bli blk bll blo bls boa bob boi bok bol boo bos bsa bsb bsi bsk bsl bso bss ia- iaa iab iai ial iao ias iba ibb ibi ibk ibl ibo ibs iia iib iii iil iio iis ika ikb iki ikk ikl iko iks il- ila ilb ili ilk ill ilo ils io- ioa iob ioi iol ioo ios is- isa isb isi isk isl iso iss ka- kaa kab kai kak kal kao kas kba kbb kbi kbk kbl kbo kbs kia kib kii kik kil kio kis kkb kki kkk kkl kks kl- kla klb kli klo kls koa kob koi kok kol koo kos ksa ksb ksi ksk ksl kso kss la- laa lab lai lak lal lao las lba lbb lbi lbk lbl lbo lbs lia lib lii lik lil lio lis lka lkb lkl lks lla llb lli llk lll llo lls loa lob loi lok lol loo los lsa lsb lsi lsk lsl lso lss o-i oaa oab oai oak oal oao oas ob- oba obb obi obk obl obo obs oia oib oii oik oil oio ois oka okb oki okk okl oko oks ola olb oli olk oll olo ols oo- ooa oob ooi ook ool ooo oos os- osa osb osi osk osl oso oss saa sab sai sak sal sao sas sba sbb sbi sbk sbl sbo sbs sia sib sii sik sil sio sis sk- ska skb ski skk skl sko sks sla slb sli slk sll slo sls soa sob soi sok sol soo sos ss- ssa ssb ssi ssk ssl sso sss