a-be aaaa aaab aaac aaae aaar aaba aabb aabc aabt aaca aacb aacc aace aacr aact aaea aaec aara aarc aare aart aata aatc aatt abaa abab abac abae abar abat abb- abba abbb abbe abbr abbt abca abcb abcc abcr abct abec abee aber abet abra abrc abta ac-t acaa acab acac acae acar acat acba acca accc acce acct ace- acea acec acer acet acr- acra acrc acre acrr acta actc acte actt aeac aecb aect aeer aer- aera aerc aeta aetc aetr aett arab arac arae arar arat arba arbe arc- arca arce arct area arec aree aret arr- arra arrc arre arrr arrt arta artc arte artr at-t ataa atab atac atae atar atat atca atcc atcr atea atec atee ater atra atrc atre atta atte attr baaa baar baat baba babb babe babr bac- baca bacc bace bact baer bar- bara barb barc bare barr bart bata batc bate batt bbbb bbeb bbet bbrc bcaa bcar bcat bcbc bcca bccc bcec bcer bcet bcra bctc bear beat beba bebb bebe beca beeb beer beet bera berc bere berr bert beta betc bete bett brab brac brae brat brca brcb brce brea breb brec bree brer bret brrr brtc btaa btcc btec btrc btrt bttb caaa caab caac caat caba cabe cac- caca cacc cace cacr caec caer cara carb carc care carr cart cat- cata catb catc cate catt cbac cbar cbat cbbc cbca cbcc cbce cbcr cbct cbea cbec cbee cber cbet cbre cbrt cbta cbtc ccaa ccab ccac ccar ccat ccba ccbc ccca cccb cccc ccee ccra ccrc ccre ccrt cctb cctc cctt ceac cear ceat ceba cec- ceca cece cect ceeb ceec cer- cera cerc cere cert cet- ceta cete crab crac crar crat crbc crca crcc crce crcr cre- crea creb crec cree cret crrt crtc ctab ctae ctba ctca ctec ctrc ctta eaba eaca eacc eaec eara earb eare eart eata eate ebac ebba ebbc ebbr ebcc eber ecaa ecac ecar ecat ecbc ecbe ecca eccb eccc ecce ecct ecra ecrc ecrr ect- ecta ectc eeca eeea eeee eera eerc eeta eetc eete erat erba erbb erbe erca ercc erce ereb erec erer eret erra errc erre erta etat etbc etbr etcc etec etee eter etra etre etta ette raab raat raba rabb rabe rac- raca racc race ract raec raer rara rarb rare rata rate ratt rbbb rbbr rcac rcbc rccb rccc rcet rctc rea- reac reae rear reat reba rebb rebe reca recc rece recr rect reeb reet rera rere rert reta rete retr rett rrat rrrr rtca rtcc rtce rtee taa- taar taat taba tabb tabc tabe taca tacc tace tact taec taer tara tarb tarc tare tarr tart tata tatb tate tatr tatt tbar tbca tbcb tbcc tbce tbrb tbta tcca tccc tctc teac tear teat teba teca tecr tect teec teer teet ter- tera terc tere terr teta tete tetr tett traa trab trac trae trat trca trcc tre- trea trec tree tret trra trtc trte trtr ttab ttbb tter tttt