-al -ol a-a a-b a-i aaa aab aai aak aal aao aar aas ab- aba abb abi abk abl abo abr abs ai- aia aib aii aik ail aio air ais aka akb aki akk akl ako akr aks al- ala alb ali alk all alo alr als aoa aob aoi aok aol aoo aor aos ar- ara arb ari ark arl aro arr ars as- asa asb asi ask asl aso asr ass baa bab bai bak bal bao bar bas bba bbb bbi bbk bbl bbo bbr bbs bi- bia bib bii bik bil bio bir bis bka bkb bkk bkl bko bkr bks bla blb bli blk bll blo blr bls boa bob boi bok bol boo bor bos bra brb bri brk brl bro brr brs bsa bsb bsi bsk bsl bso bsr bss ia- iaa iab iai ial iao iar ias iba ibb ibi ibk ibl ibo ibr ibs iia iib iii iil iio iir iis ika ikb iki ikk ikl iko ikr iks il- ila ilb ili ilk ill ilo ilr ils io- ioa iob ioi iol ioo ior ios ir- ira irb iri irk irl iro irr irs is- isa isb isi isk isl iso isr iss ka- kaa kab kai kak kal kao kar kas kba kbb kbi kbk kbl kbo kbr kbs kia kib kii kik kil kio kir kis kkb kki kkk kkl kkr kks kl- kla klb kli klo klr kls koa kob koi kok kol koo kor kos kra kri krk krl kro krr krs ksa ksb ksi ksk ksl kso ksr kss la- laa lab lai lak lal lao lar las lba lbb lbi lbk lbl lbo lbr lbs lia lib lii lik lil lio lir lis lka lkb lkl lkr lks lla llb lli llk lll llo llr lls loa lob loi lok lol loo lor los lra lrb lri lrk lro lrr lrs lsa lsb lsi lsk lsl lso lsr lss o-i oaa oab oai oak oal oao oar oas ob- oba obb obi obk obl obo obr obs oia oib oii oik oil oio oir ois oka okb oki okk okl oko okr oks ola olb oli olk oll olo ols oo- ooa oob ooi ook ool ooo oor oos or- ora orb ori ork orl oro orr ors os- osa osb osi osk osl oso osr oss ra- raa rab rai rak ral rao rar ras rba rbb rbi rbk rbl rbo rbr rbs ria rib rii rik ril rio rir ris rkb rkk rko rks rla rli rll rlo rlr rls roa rob roi rok rol roo ror ros rra rrb rri rrk rrl rrr rrs rsa rsb rsi rsk rsl rso rsr rss saa sab sai sak sal sao sar sas sba sbb sbi sbk sbl sbo sbr sbs sia sib sii sik sil sio sir sis sk- ska skb ski skk skl sko skr sks sla slb sli slk sll slo slr sls soa sob soi sok sol soo sor sos sr- sra srb sri srk srl sro srr srs ss- ssa ssb ssi ssk ssl sso ssr sss