-al -ol a-a a-b a-c aaa aab aac aaf aal aan aao aar aau ab- aba abb abc abf abl abn abo abr abu ac- aca acb acc acf acl acn aco acr acu af- afa afb afc aff afl afn afo afr afu al- ala alb alc alf all aln alo alr alu an- ana anb anc anf anl ann ano anr anu aoa aob aoc aof aol aon aoo aor aou ar- ara arb arc arf arl arn aro arr aru au- aua aub auc auf aul aun auo aur b-u baa bab bac baf bal ban bao bar bau bba bbb bbc bbf bbl bbn bbo bbr bbu bca bcb bcc bcf bcl bcn bco bcr bcu bfa bfb bfc bff bfl bfn bfo bfr bfu bla blb blc blf bll bln blo blr blu bna bnb bnc bnf bnl bnn bno bnr bnu boa bob boc bof bol bon boo bor bou bra brb brf brl brn bro brr bru bua bub buc buf bul bun buo bur buu c-- caa cab cac caf cal can cao car cau cba cbb cbc cbf cbl cbn cbo cbr cbu cca ccb ccc ccf ccl ccn cco ccr ccu cfa cfb cfc cff cfl cfn cfo cfr cfu cl- cla clb clc clf cll cln clo clr clu cn- cna cnb cnc cnf cnl cnn cno cnr cnu co- coa cob coc cof col con coo cor cou cra crb crc crf crl crn cro crr cru cua cub cuc cuf cul cun cuo cur cuu faa fab fac faf fal fan fao far fau fba fbb fbc fbf fbl fbn fbo fbr fbu fca fcb fcc fcf fcl fcn fco fcr fcu ffa ffc fff ffl ffn ffo ffr ffu fla flb flc flf fll fln flo flr flu fna fnb fnc fnf fnl fnn fnr fnu foa fob foc fof fol fon foo for fou fra frb frc frf frl frn fro frr fru fua fub fuf ful fun fuo fur fuu la- laa lab lac laf lal lan lao lar lau lba lbb lbc lbf lbl lbo lbr lbu lca lcb lcc lcf lcl lcn lco lcr lcu lfa lfb lfc lff lfl lfn lfo lfr lfu lla llb llc llf lll lln llo llr llu lna lnb lnc lnl lnn lno lnr lnu loa lob loc lof lol lon loo lor lou lra lrb lrc lrf lrn lro lrr lru lua lub luc luf lul lun luo lur luu naa nab nac naf nal nan nao nar nau nba nbb nbc nbf nbl nbn nbo nbr nbu nca ncb ncc ncf ncl ncn nco ncr ncu nfa nfb nfc nff nfl nfn nfo nfr nfu nla nlb nlc nlf nll nln nlo nlr nlu nna nnb nnc nnf nnl nnn nno nnu no- noa nob noc nof nol non noo nor nou nra nrb nrc nrf nrl nrn nro nrr nru nua nub nuc nul nun nuo nur nuu oaa oab oac oaf oal oan oao oar oau ob- oba obb obc obf obl obn obo obr obu oc- oca ocb occ ocf ocl ocn oco ocr ocu of- ofa ofb ofc off ofl ofn ofo ofr ofu ola olb olc olf oll oln olo olu on- ona onb onc onf onl onn ono onr onu oo- ooa oob ooc oof ool oon ooo oor or- ora orb orc orf orl orn oro orr oru ou- oua ouc ouf oul oun ouo our ra- raa rab rac raf ral ran rao rar rau rba rbb rbc rbf rbl rbn rbo rbr rbu rca rcb rcc rcf rcl rcn rco rcr rcu rfa rfb rfc rff rfl rfn rfo rfr rfu rla rlc rlf rll rln rlo rlr rlu rna rnb rnc rnn rno rnr rnu roa rob roc rof rol ron roo ror rou rra rrb rrc rrf rrl rrn rrr rru rua rub ruc ruf run ruo rur ruu ua- uaa uab uac uaf ual uan uao uar uau uba ubb ubc ubf ubl ubn ubo ubr ubu uca ucb ucc ucf ucl ucn uco ucr ucu ufa ufc uff ufl ufn ufo ufr ufu ula ulb ulc ulf ull uln ulo ulr ulu un- una unb unc unf unl unn uno unr unu uoa uob uoc uol uon uoo uor ur- ura urb urc urf url urn uro urr uru uua uuc uun uur uuu