-al -ol a-a a-b a-c a-t aaa aab aac aaf aal aan aao aar aat ab- aba abb abc abf abl abn abo abr abt ac- aca acb acc acf acl acn aco acr act af- afa afb afc aff afl afn afo afr aft al- ala alb alc alf all aln alo alr alt an- ana anb anc anf anl ann ano anr ant aoa aob aoc aof aol aon aoo aor aot ar- ara arb arc arf arl arn aro arr art at- ata atb atc atf atl atn ato atr att baa bab bac baf bal ban bao bar bat bba bbb bbc bbf bbl bbn bbo bbr bbt bca bcb bcc bcf bcl bcn bco bcr bct bfa bfb bfc bff bfl bfn bfo bfr bft bla blb blc blf bll bln blo blr blt bna bnb bnc bnf bnl bnn bno bnr bnt boa bob boc bof bol bon boo bor bot bra brb brf brl brn bro brr brt bta btb btc btf btl btn bto btr btt c-- caa cab cac caf cal can cao car cat cba cbb cbc cbf cbl cbn cbo cbr cbt cca ccb ccc ccf ccl ccn cco ccr cct cfa cfb cfc cff cfl cfn cfo cfr cft cl- cla clb clc clf cll cln clo clr clt cn- cna cnb cnc cnf cnl cnn cno cnr cnt co- coa cob coc cof col con coo cor cot cra crb crc crf crl crn cro crr crt cta ctb ctc ctf ctl ctn cto ctr ctt faa fab fac faf fal fan fao far fat fba fbb fbc fbf fbl fbn fbo fbr fbt fca fcb fcc fcf fcl fcn fco fcr fct ffa ffc fff ffl ffn ffo ffr fft fla flb flc flf fll fln flo flr flt fna fnb fnc fnf fnl fnn fnr fnt foa fob foc fof fol fon foo for fot fra frb frc frf frl frn fro frr frt fta ftb ftc ftf ftl ftn fto ftr ftt la- laa lab lac laf lal lan lao lar lat lba lbb lbc lbf lbl lbo lbr lbt lca lcb lcc lcf lcl lcn lco lcr lct lfa lfb lfc lff lfl lfn lfo lfr lft lla llb llc llf lll lln llo llr llt lna lnb lnc lnl lnn lno lnr lnt loa lob loc lof lol lon loo lor lot lra lrb lrc lrf lrn lro lrr lrt lta ltb ltc ltf ltl lto ltr ltt naa nab nac naf nal nan nao nar nat nba nbb nbc nbf nbl nbn nbo nbr nbt nca ncb ncc ncf ncl ncn nco ncr nct nfa nfb nfc nff nfl nfn nfo nfr nft nla nlb nlc nlf nll nln nlo nlr nlt nna nnb nnc nnf nnl nnn nno nnt no- noa nob noc nof nol non noo nor not nra nrb nrc nrf nrl nrn nro nrr nrt nta ntb ntc ntf ntn nto ntr ntt oaa oab oac oaf oal oan oao oar oat ob- oba obb obc obf obl obn obo obr obt oc- oca ocb occ ocf ocl ocn oco ocr oct of- ofa ofb ofc off ofl ofn ofo ofr oft ola olb olc olf oll oln olo olt on- ona onb onc onf onl onn ono onr ont oo- ooa oob ooc oof ool oon ooo oor oot or- ora orb orc orf orl orn oro orr ort ot- ota otb otc otf otl otn oto otr ott ra- raa rab rac raf ral ran rao rar rat rba rbb rbc rbf rbl rbn rbo rbr rbt rca rcb rcc rcf rcl rcn rco rcr rct rfa rfb rfc rff rfl rfn rfo rfr rft rla rlc rlf rll rln rlo rlr rlt rna rnb rnc rnn rno rnr rnt roa rob roc rof rol ron roo ror rot rra rrb rrc rrf rrl rrn rrr rrt rta rtb rtc rtf rtl rtn rto rtr rtt taa tab tac taf tal tan tao tar tat tba tbb tbc tbf tbl tbn tbo tbr tbt tca tcb tcc tcf tcl tcn tco tcr tct tfa tfb tfc tff tfl tfn tfo tfr tft tla tlc tlf tll tln tlo tlr tlt tna tnb tnc tnf tnl tnn tno tnr tnt to- toa tob toc tof tol ton too tor tot tra trb trc trf trl trn tro trr trt tta ttb ttc ttf ttl ttn tto ttr ttt