-al -ol a-a a-b a-i aaa aab aaf aai aak aal aan aao aar aas ab- aba abb abf abi abk abl abn abo abr abs af- afa afb aff afi afk afl afn afo afr afs ai- aia aib aif aii aik ail ain aio air ais aka akb aki akk akl akn ako akr aks al- ala alb alf ali alk all aln alo alr als an- ana anb anf ani ank anl ann ano anr ans aoa aob aof aoi aok aol aon aoo aor aos ar- ara arb arf ari ark arl arn aro arr ars as- asa asb asf asi ask asl asn aso asr ass baa bab baf bai bak bal ban bao bar bas bba bbb bbf bbi bbk bbl bbn bbo bbr bbs bfa bfb bff bfi bfl bfn bfo bfr bfs bi- bia bib bif bii bik bil bin bio bir bis bka bkb bkf bkk bkl bkn bko bkr bks bla blb blf bli blk bll bln blo blr bls bna bnb bnf bni bnk bnl bnn bno bnr bns boa bob bof boi bok bol bon boo bor bos bra brb brf bri brk brl brn bro brr brs bsa bsb bsf bsi bsk bsl bsn bso bsr bss faa fab faf fai fak fal fan fao far fas fba fbb fbf fbi fbk fbl fbn fbo fbr fbs ffa fff ffi ffk ffl ffn ffo ffr ffs fia fib fif fii fik fil fin fir fis fka fkb fkf fki fkk fkl fla flb flf fli fll fln flo flr fls fna fnb fnf fni fnk fnl fnn fnr fns foa fob fof foi fok fol fon foo for fos fra frb frf fri frk frl frn fro frr frs fsa fsb fsf fsi fsk fsl fsn fso fsr fss i-f ia- iaa iab iaf iai ial ian iao iar ias iba ibb ibf ibi ibk ibl ibn ibo ibr ibs ifa ifb iff ifi ifl ifn ifo ifr ifs iia iib iif iii iil iin iio iir iis ika ikb ikf iki ikk ikl iko ikr iks il- ila ilb ilf ili ilk ill iln ilo ilr ils in- ina inb inf ini ink inl inn ino inr ins io- ioa iob iof ioi iol ion ioo ior ios ir- ira irb irf iri irk irl irn iro irr irs is- isa isb isf isi isk isl isn iso isr iss ka- kaa kab kaf kai kak kal kan kao kar kas kba kbb kbf kbi kbk kbl kbn kbo kbr kbs kfa kff kfi kfo kfs kia kib kif kii kik kil kin kio kir kis kkb kki kkk kkl kkn kkr kks kl- kla klb klf kli klo klr kls kn- kna knf kni knk knl knn kno knr koa kob kof koi kok kol kon koo kor kos kra krf kri krk krl krn kro krr krs ksa ksb ksf ksi ksk ksl ksn kso ksr kss la- laa lab laf lai lak lal lan lao lar las lba lbb lbf lbi lbk lbl lbo lbr lbs lfa lfb lff lfi lfk lfl lfn lfo lfr lfs lia lib lif lii lik lil lin lio lir lis lka lkb lkl lkr lks lla llb llf lli llk lll lln llo llr lls lna lnb lni lnk lnl lnn lno lnr lns loa lob lof loi lok lol lon loo lor los lra lrb lrf lri lrk lrn lro lrr lrs lsa lsb lsf lsi lsk lsl lsn lso lsr lss n-i naa nab naf nai nak nal nan nao nar nas nba nbb nbf nbi nbk nbl nbn nbo nbr nbs nfa nfb nff nfi nfk nfl nfn nfo nfr nfs nia nib nif nii nik nil nin nio nir nis nka nkf nki nkk nkn nko nkr nks nla nlb nlf nli nlk nll nln nlo nlr nls nna nnb nnf nni nnk nnl nnn nno nns no- noa nob nof noi nok nol non noo nor nos nra nrb nrf nri nrk nrl nrn nro nrr nrs nsa nsb nsf nsi nsk nsl nsn nso nsr nss o-i oaa oab oaf oai oak oal oan oao oar oas ob- oba obb obf obi obk obl obn obo obr obs of- ofa ofb off ofi ofl ofn ofo ofr ofs oia oib oif oii oik oil oin oio oir ois oka okb oki okk okl oko okr oks ola olb olf oli olk oll oln olo ols on- ona onb onf oni onk onl onn ono onr ons oo- ooa oob oof ooi ook ool oon ooo oor oos or- ora orb orf ori ork orl orn oro orr ors os- osa osb osf osi osk osl osn oso osr oss ra- raa rab raf rai rak ral ran rao rar ras rba rbb rbf rbi rbk rbl rbn rbo rbr rbs rfa rfb rff rfi rfk rfl rfn rfo rfr rfs ria rib rif rii rik ril rin rio rir ris rkb rkf rkk rko rks rla rlf rli rll rln rlo rlr rls rna rnb rni rnn rno rnr rns roa rob rof roi rok rol ron roo ror ros rra rrb rrf rri rrk rrl rrn rrr rrs rsa rsb rsf rsi rsk rsl rsn rso rsr rss saa sab saf sai sak sal san sao sar sas sba sbb sbf sbi sbk sbl sbn sbo sbr sbs sfa sfb sff sfi sfk sfl sfn sfo sfr sfs sia sib sif sii sik sil sin sio sir sis sk- ska skb skf ski skk skl sko skr sks sla slb slf sli slk sll sln slo slr sls sna snb snf sni snk snl snn sno snr sns soa sob sof soi sok sol son soo sor sos sr- sra srb srf sri srk srl srn sro srr srs ss- ssa ssb ssf ssi ssk ssl ssn sso ssr sss