-al -ol a-a a-b a-c aaa aab aac aae aaf aak aal aao aau ab- aba abb abc abe abf abk abl abo abu ac- aca acb acc ace acf ack acl aco acu aea aeb aec aee aef aek ael aeo aeu af- afa afb afc afe aff afk afl afo afu aka akb akc ake akk akl ako aku al- ala alb alc ale alf alk all alo alu aoa aob aoc aoe aof aok aol aoo aou au- aua aub auc aue auf auk aul auo b-u baa bab bac bae baf bak bal bao bau bba bbb bbc bbe bbf bbk bbl bbo bbu bca bcb bcc bce bcf bck bcl bco bcu be- bea beb bec bee bef bek bel beo beu bfa bfb bfc bfe bff bfl bfo bfu bka bkb bkc bke bkf bkk bkl bko bla blb blc ble blf blk bll blo blu boa bob boc boe bof bok bol boo bou bua bub buc bue buf buk bul buo buu c-- caa cab cac cae caf cak cal cao cau cba cbb cbc cbe cbf cbk cbl cbo cbu cca ccb ccc cce ccf cck ccl cco ccu ce- cea ceb cec cee cef cek cel ceo ceu cfa cfb cfc cfe cff cfk cfl cfo cfu cka ckb ckc cko cl- cla clb clc cle clf clk cll clo clu co- coa cob coc coe cof cok col coo cou cua cub cuc cue cuf cuk cul cuo cuu eaa eab eac eae eaf eak eal eao eau eba ebb ebc ebe ebf ebk ebl ebo ebu ec- eca ecb ecc ece ecf eck ecl eco ecu eea eeb eec eee eef eek eel eeo ef- efa efb efc efe eff efl efo eka ekb ekc eke ekf ekl eko eku ela elb elc ele elf elk ell elo elu eo- eoa eob eoc eoe eof eok eol eoo eou eu- eua eub euc eue euf eul faa fab fac fae faf fak fal fao fau fba fbb fbc fbe fbf fbk fbl fbo fbu fca fcb fcc fce fcf fck fcl fco fcu fea feb fec fee fef fek fel feo feu ffa ffc ffe fff ffk ffl ffo ffu fka fkb fkc fkf fkk fkl fla flb flc fle flf fll flo flu foa fob foc foe fof fok fol foo fou fua fub fue fuf fuk ful fuo fuu ka- kaa kab kac kae kaf kak kal kao kau kba kbb kbc kbe kbf kbk kbl kbo kbu kca kcb kcc kce kck kcl kcu ke- kea keb kec kee kef kek kel keo kfa kfc kff kfo kfu kkb kkc kke kkk kkl kku kl- kla klb klc klf klo klu koa kob koc koe kof kok kol koo kou kub kuc kue kuk kul kuu la- laa lab lac lae laf lak lal lao lau lba lbb lbc lbe lbf lbk lbl lbo lbu lca lcb lcc lce lcf lck lcl lco lcu lea leb lec lee lef lek lel leo leu lfa lfb lfc lfe lff lfk lfl lfo lfu lka lkb lkl lla llb llc lle llf llk lll llo llu loa lob loc loe lof lok lol loo lou lua lub luc lue luf luk lul luo luu oaa oab oac oae oaf oak oal oao oau ob- oba obb obc obe obf obk obl obo obu oc- oca ocb occ ocf ock ocl oco ocu oea oeb oec oee oef oel oeo of- ofa ofb ofc ofe off ofl ofo ofu oka okb okc oke okk okl oko oku ola olb olc ole olf olk oll olo olu oo- ooa oob ooc oof ook ool ooo ou- oua ouc oue ouf ouk oul ouo ua- uaa uab uac uae uaf uak ual uao uau uba ubb ubc ube ubf ubk ubl ubo ubu uca ucb ucc uce ucf uck ucl uco ucu uea ueb uec uee uef uel ufa ufc ufe uff ufl ufo ufu uka ukb ukc uke ukf ukk ukl uku ula ulb ulc ule ulf ulk ull ulo ulu uoa uob uoc uoe uok uol uoo uua uuc uue uuu