-al -ol a-a a-b aaa aab aak aal aan aao aar aas ab- aba abb abk abl abn abo abr abs aka akb akk akl akn ako akr aks al- ala alb alk all aln alo alr als an- ana anb ank anl ann ano anr ans aoa aob aok aol aon aoo aor aos ar- ara arb ark arl arn aro arr ars as- asa asb ask asl asn aso asr ass baa bab bak bal ban bao bar bas bba bbb bbk bbl bbn bbo bbr bbs bka bkb bkk bkl bkn bko bkr bks bla blb blk bll bln blo blr bls bna bnb bnk bnl bnn bno bnr bns boa bob bok bol bon boo bor bos bra brb brk brl brn bro brr brs bsa bsb bsk bsl bsn bso bsr bss ka- kaa kab kak kal kan kao kar kas kba kbb kbk kbl kbn kbo kbr kbs kkb kkk kkl kkn kkr kks kl- kla klb klo klr kls kn- kna knk knl knn kno knr koa kob kok kol kon koo kor kos kra krk krl krn kro krr krs ksa ksb ksk ksl ksn kso ksr kss la- laa lab lak lal lan lao lar las lba lbb lbk lbl lbo lbr lbs lka lkb lkl lkr lks lla llb llk lll lln llo llr lls lna lnb lnk lnl lnn lno lnr lns loa lob lok lol lon loo lor los lra lrb lrk lrn lro lrr lrs lsa lsb lsk lsl lsn lso lsr lss naa nab nak nal nan nao nar nas nba nbb nbk nbl nbn nbo nbr nbs nka nkk nkn nko nkr nks nla nlb nlk nll nln nlo nlr nls nna nnb nnk nnl nnn nno nns no- noa nob nok nol non noo nor nos nra nrb nrk nrl nrn nro nrr nrs nsa nsb nsk nsl nsn nso nsr nss oaa oab oak oal oan oao oar oas ob- oba obb obk obl obn obo obr obs oka okb okk okl oko okr oks ola olb olk oll oln olo ols on- ona onb onk onl onn ono onr ons oo- ooa oob ook ool oon ooo oor oos or- ora orb ork orl orn oro orr ors os- osa osb osk osl osn oso osr oss ra- raa rab rak ral ran rao rar ras rba rbb rbk rbl rbn rbo rbr rbs rkb rkk rko rks rla rll rln rlo rlr rls rna rnb rnn rno rnr rns roa rob rok rol ron roo ror ros rra rrb rrk rrl rrn rrr rrs rsa rsb rsk rsl rsn rso rsr rss saa sab sak sal san sao sar sas sba sbb sbk sbl sbn sbo sbr sbs sk- ska skb skk skl sko skr sks sla slb slk sll sln slo slr sls sna snb snk snl snn sno snr sns soa sob sok sol son soo sor sos sr- sra srb srk srl srn sro srr srs ss- ssa ssb ssk ssl ssn sso ssr sss