-al -ol a-a a-b aaa aab aak aal aao aar aas ab- aba abb abk abl abo abr abs aka akb akk akl ako akr aks al- ala alb alk all alo alr als aoa aob aok aol aoo aor aos ar- ara arb ark arl aro arr ars as- asa asb ask asl aso asr ass baa bab bak bal bao bar bas bba bbb bbk bbl bbo bbr bbs bka bkb bkk bkl bko bkr bks bla blb blk bll blo blr bls boa bob bok bol boo bor bos bra brb brk brl bro brr brs bsa bsb bsk bsl bso bsr bss ka- kaa kab kak kal kao kar kas kba kbb kbk kbl kbo kbr kbs kkb kkk kkl kkr kks kl- kla klb klo klr kls koa kob kok kol koo kor kos kra krk krl kro krr krs ksa ksb ksk ksl kso ksr kss la- laa lab lak lal lao lar las lba lbb lbk lbl lbo lbr lbs lka lkb lkl lkr lks lla llb llk lll llo llr lls loa lob lok lol loo lor los lra lrb lrk lro lrr lrs lsa lsb lsk lsl lso lsr lss oaa oab oak oal oao oar oas ob- oba obb obk obl obo obr obs oka okb okk okl oko okr oks ola olb olk oll olo ols oo- ooa oob ook ool ooo oor oos or- ora orb ork orl oro orr ors os- osa osb osk osl oso osr oss ra- raa rab rak ral rao rar ras rba rbb rbk rbl rbo rbr rbs rkb rkk rko rks rla rll rlo rlr rls roa rob rok rol roo ror ros rra rrb rrk rrl rrr rrs rsa rsb rsk rsl rso rsr rss saa sab sak sal sao sar sas sba sbb sbk sbl sbo sbr sbs sk- ska skb skk skl sko skr sks sla slb slk sll slo slr sls soa sob sok sol soo sor sos sr- sra srb srk srl sro srr srs ss- ssa ssb ssk ssl sso ssr sss