a-be aaaa aaab aaac aaae aaal aaba aabb aabc aabl aabt aaca aacb aacc aace aacl aaco aact aaea aaec aala aalc aale aall aalo aaoe aaoo aata aatc aatt abaa abab abac abae abal abat abb- abba abbb abbe abbo abbt abca abcb abcc abcl abct abec abee abel abet abla able ablo aboa abob abol aboo abot abta ac-t acaa acab acac acae acat acba acbl acca accc acce acco acct ace- acea acec acel acet acla aclc acle acoa acoe acol acot acta actc acte actl acto actt aeac aecb aecl aect aela aelc aeta aetc aeto aett alaa alac alae alal alao alat alb- alba albc albe albo alca alcc alce alco alea alec alee aleo alet all- alla alle alll allo aloa aloc aloe alol aloo alot alta alte alto aoba aoca aoce aola aole aotc at-l at-t ataa atab atac atae atal atat atca atcc atcl atco atea atec atee atel ateo atla atle atlo atob atoc atoe atol atot atta atte atto baaa baal baat baba babb babe babo bac- baca bacc bace baco bact bael bala balc bale ball balo balt baol bata batc bate bato batt bbbb bbeb bbet bblb bcaa bcat bcbc bcca bccc bccl bcec bcet bctc beal beat beba bebb bebe bebo beca beeb beel beet bela bele bell belo belt beo- beot beta betc bete beto bett blaa blab blac blae blat blbt blea bleb blee bleo blet blob bloc bloo blot boab boac boal boat boba bobb bobe bobo boca boce boco boea boec boee boel boeo boet bola bole boll bolo bolt boob booc booe bool boot bota botb bote boto bott btaa btcc btcl btec btla btob bttb c-bo caaa caab caac caal caat caba cabe cabo cac- caca cacc cace caco caec cala calc cale call calo calt caol cat- cata catb catc cate cato catt cbac cbal cbat cbbc cbca cbcc cbce cbcl cbct cbea cbec cbee cbet cblb cblc cbol cbot cbta cbtc cbtl ccaa ccab ccac ccat ccba ccbc ccca cccb cccc cccl ccee ccel ccla cclc ccob ccoc cctb cctc cctl cctt ceac ceal ceat ceba cec- ceca cece ceco cect ceeb ceec ceel cel- cela celc cele cell celo celt ceol cet- ceta cete ceto clab clat clea clec clee cleo clet clob cloe cloo clot cltb cltc coal coat coba cobb cobe cobo coca coce coco coct coel col- cola colb cole coll colo colt coob cool coot cota cotb cotc cote coto cott ctab ctae ctal ctba ctca ctec ctle ctol ctot ctta e-cl e-la eaba eaca eacc eaec eala ealc eale eata eate ebac ebal ebba ebbc ebbo ebcc ebel ebla eboe ebol eboo ecaa ecac ecal ecao ecat ecbc ecbe ecca eccb eccc ecce eccl ecco ecct ecla eclt eco- ecol ecot ect- ecta ectc ecto eeca eeea eeee eele eeoc eeta eetc eete el-b elab elac elal elat elba elbe elbo elca elcb elce elco elea elec elee eleo elet ella elle ello elta elte elto eola eole eolo eota eotc eoto etal etat etbc etcc etco etec etee etel etla etoe etta ette etto laaa laac laal laat laba labe labo laca lacc lace lacl laco lact lael laet lala lale lall lalo lata latc late lato latt lbcc lcac lcat lcbc lcca lccc lcce lctl lcto leaa leal leao leat leba lebo leca lece leco lect leea leel leet lela lele lell lelo leoc leta lete leto lett llao llat llcc llet lllc llll lloa lloc lloo loac loat lob- loba lobb lobe lobo loca locc loce loco loeb lola lole loll lolo loob looc looe lool loot lota lote lotl loto lott ltac ltae ltbl ltcc ltee lttc o-eo oall oate obal obba obbo obea obec obel obet obla oble oboe obol obot ocab ocac ocal ocat ocbc occa occc occt oce ocee ocet oclc oct- octa octe octo oec- oeca oecc oeec oela oele oeta olac olat olba olbo olca olcc ole- olea oleo olet olla olle ollo olot olta ooaa ooba oobe oola oolo oooo ootb otac otcl otea otee oto- otoe otoo otta otte otto taa- taal taat taba tabb tabc tabe tabl tabo taca tacc tace tacl taco tact taec tael tala talc tale tall talo taoa tata tatb tate tato tatt tbca tbcb tbcc tbce tbta tcca tccc tctc teac teal teat teba tebo teca tecl teco tect teec teel teet tel- tela telc tele tell telo telt teta tete teto tett tlac tlco toab toal toat toba tobe tobo tobt toca toce toco toea toee toet tol- tola tole toll tolo tolt tooa tool toot tota totc tote toto tott ttab ttbb tteo ttoe tttt