-al -ol a-a a-b a-i aaa aab aaf aai aak aal aao aar aas ab- aba abb abf abi abk abl abo abr abs af- afa afb aff afi afk afl afo afr afs ai- aia aib aif aii aik ail aio air ais aka akb aki akk akl ako akr aks al- ala alb alf ali alk all alo alr als aoa aob aof aoi aok aol aoo aor aos ar- ara arb arf ari ark arl aro arr ars as- asa asb asf asi ask asl aso asr ass baa bab baf bai bak bal bao bar bas bba bbb bbf bbi bbk bbl bbo bbr bbs bfa bfb bff bfi bfl bfo bfr bfs bi- bia bib bif bii bik bil bio bir bis bka bkb bkf bkk bkl bko bkr bks bla blb blf bli blk bll blo blr bls boa bob bof boi bok bol boo bor bos bra brb brf bri brk brl bro brr brs bsa bsb bsf bsi bsk bsl bso bsr bss faa fab faf fai fak fal fao far fas fba fbb fbf fbi fbk fbl fbo fbr fbs ffa fff ffi ffk ffl ffo ffr ffs fia fib fif fii fik fil fir fis fka fkb fkf fki fkk fkl fla flb flf fli fll flo flr fls foa fob fof foi fok fol foo for fos fra frb frf fri frk frl fro frr frs fsa fsb fsf fsi fsk fsl fso fsr fss i-f ia- iaa iab iaf iai ial iao iar ias iba ibb ibf ibi ibk ibl ibo ibr ibs ifa ifb iff ifi ifl ifo ifr ifs iia iib iif iii iil iio iir iis ika ikb ikf iki ikk ikl iko ikr iks il- ila ilb ilf ili ilk ill ilo ilr ils io- ioa iob iof ioi iol ioo ior ios ir- ira irb irf iri irk irl iro irr irs is- isa isb isf isi isk isl iso isr iss ka- kaa kab kaf kai kak kal kao kar kas kba kbb kbf kbi kbk kbl kbo kbr kbs kfa kff kfi kfo kfs kia kib kif kii kik kil kio kir kis kkb kki kkk kkl kkr kks kl- kla klb klf kli klo klr kls koa kob kof koi kok kol koo kor kos kra krf kri krk krl kro krr krs ksa ksb ksf ksi ksk ksl kso ksr kss la- laa lab laf lai lak lal lao lar las lba lbb lbf lbi lbk lbl lbo lbr lbs lfa lfb lff lfi lfk lfl lfo lfr lfs lia lib lif lii lik lil lio lir lis lka lkb lkl lkr lks lla llb llf lli llk lll llo llr lls loa lob lof loi lok lol loo lor los lra lrb lrf lri lrk lro lrr lrs lsa lsb lsf lsi lsk lsl lso lsr lss o-i oaa oab oaf oai oak oal oao oar oas ob- oba obb obf obi obk obl obo obr obs of- ofa ofb off ofi ofl ofo ofr ofs oia oib oif oii oik oil oio oir ois oka okb oki okk okl oko okr oks ola olb olf oli olk oll olo ols oo- ooa oob oof ooi ook ool ooo oor oos or- ora orb orf ori ork orl oro orr ors os- osa osb osf osi osk osl oso osr oss ra- raa rab raf rai rak ral rao rar ras rba rbb rbf rbi rbk rbl rbo rbr rbs rfa rfb rff rfi rfk rfl rfo rfr rfs ria rib rif rii rik ril rio rir ris rkb rkf rkk rko rks rla rlf rli rll rlo rlr rls roa rob rof roi rok rol roo ror ros rra rrb rrf rri rrk rrl rrr rrs rsa rsb rsf rsi rsk rsl rso rsr rss saa sab saf sai sak sal sao sar sas sba sbb sbf sbi sbk sbl sbo sbr sbs sfa sfb sff sfi sfk sfl sfo sfr sfs sia sib sif sii sik sil sio sir sis sk- ska skb skf ski skk skl sko skr sks sla slb slf sli slk sll slo slr sls soa sob sof soi sok sol soo sor sos sr- sra srb srf sri srk srl sro srr srs ss- ssa ssb ssf ssi ssk ssl sso ssr sss