a-be aaaa aaab aaac aaae aaal aaba aabb aabc aabl aabt aaca aacb aacc aace aacl aact aaea aaec aala aalc aale aall aata aatc aatt abaa abab abac abae abal abat abb- abba abbb abbe abbt abca abcb abcc abcl abct abec abee abel abet abla able abta ac-t acaa acab acac acae acat acba acbl acca accc acce acct ace- acea acec acel acet acla aclc acle acta actc acte actl actt aeac aecb aecl aect aela aelc aeta aetc aett alaa alac alae alal alat alb- alba albc albe alca alcc alce alea alec alee alet all- alla alle alll alta alte at-l at-t ataa atab atac atae atal atat atca atcc atcl atea atec atee atel atla atle atta atte baaa baal baat baba babb babe bac- baca bacc bace bact bael bala balc bale ball balt bata batc bate batt bbbb bbeb bbet bblb bcaa bcat bcbc bcca bccc bccl bcec bcet bctc beal beat beba bebb bebe beca beeb beel beet bela bele bell belt beta betc bete bett blaa blab blac blae blat blbt blea bleb blee blet btaa btcc btcl btec btla bttb caaa caab caac caal caat caba cabe cac- caca cacc cace caec cala calc cale call calt cat- cata catb catc cate catt cbac cbal cbat cbbc cbca cbcc cbce cbcl cbct cbea cbec cbee cbet cblb cblc cbta cbtc cbtl ccaa ccab ccac ccat ccba ccbc ccca cccb cccc cccl ccee ccel ccla cclc cctb cctc cctl cctt ceac ceal ceat ceba cec- ceca cece cect ceeb ceec ceel cel- cela celc cele cell celt cet- ceta cete clab clat clea clec clee clet cltb cltc ctab ctae ctal ctba ctca ctec ctle ctta e-cl e-la eaba eaca eacc eaec eala ealc eale eata eate ebac ebal ebba ebbc ebcc ebel ebla ecaa ecac ecal ecat ecbc ecbe ecca eccb eccc ecce eccl ecct ecla eclt ect- ecta ectc eeca eeea eeee eele eeta eetc eete el-b elab elac elal elat elba elbe elca elcb elce elea elec elee elet ella elle elta elte etal etat etbc etcc etec etee etel etla etta ette laaa laac laal laat laba labe laca lacc lace lacl lact lael laet lala lale lall lata latc late latt lbcc lcac lcat lcbc lcca lccc lcce lctl leaa leal leat leba leca lece lect leea leel leet lela lele lell leta lete lett llat llcc llet lllc llll ltac ltae ltbl ltcc ltee lttc taa- taal taat taba tabb tabc tabe tabl taca tacc tace tacl tact taec tael tala talc tale tall tata tatb tate tatt tbca tbcb tbcc tbce tbta tcca tccc tctc teac teal teat teba teca tecl tect teec teel teet tel- tela telc tele tell telt teta tete tett tlac ttab ttbb tttt