-er a-a a-b a-c a-t aaa aab aac aae aar aat aau ab- aba abb abc abe abr abt abu ac- aca acb acc ace acr act acu aea aeb aec aee aer aet aeu ar- ara arb arc are arr art aru at- ata atb atc ate atr att atu au- aua aub auc aue aur aut b-u baa bab bac bae bar bat bau bba bbb bbc bbe bbr bbt bbu bca bcb bcc bce bcr bct bcu be- bea beb bec bee ber bet beu bra brb bre brr brt bru bta btb btc bte btr btt btu bua bub buc bue bur but buu c-- caa cab cac cae car cat cau cba cbb cbc cbe cbr cbt cbu cca ccb ccc cce ccr cct ccu ce- cea ceb cec cee cer cet ceu cra crb crc cre crr crt cru cta ctb ctc cte ctr ctt ctu cua cub cuc cue cur cut cuu eaa eab eac eae ear eat eau eba ebb ebc ebe ebr ebt ebu ec- eca ecb ecc ece ecr ect ecu eea eeb eec eee eer eet era erb erc ere err ert eru eta etb etc ete etr ett etu eu- eua eub euc eue eur eut ra- raa rab rac rae rar rat rau rba rbb rbc rbe rbr rbt rbu rca rcb rcc rce rcr rct rcu re- rea reb rec ree rer ret reu rra rrb rrc rrr rrt rru rta rtb rtc rte rtr rtt rtu rua rub ruc rue rur rut ruu taa tab tac tae tar tat tau tba tbb tbc tbe tbr tbt tbu tca tcb tcc tce tcr tct tcu te- tea teb tec tee ter tet teu tra trb trc tre trr trt tru tta ttb ttc tte ttr ttt ttu tua tub tuc tue tur tut tuu ua- uaa uab uac uae uar uat uau uba ubb ubc ube ubr ubt ubu uca ucb ucc uce ucr uct ucu uea ueb uec uee uer uet ur- ura urb urc ure urr urt uru uta utb utc ute utr utt utu uua uuc uue uur uut uuu

a-be aaaa aaab aaac aaae aaar aaba aabb aabc aabt aaca aacb aacc aace aacr aact aacu aaea aaec aara aarc aare aart aaru aata aatc aatt abaa abab abac abae abar abat abau abb- abba abbb abbe abbr abbt abca abcb abcc abcr abct abec abee aber abet abra abrc abta abtu abua abue abut ac-t acaa acab acac acae acar acat acba acca accc acce acct accu ace- acea acec acer acet acr- acra acrc acre acrr acta actc acte actt actu acu- acue acur acut aeac aecb aect aeer aer- aera aerc aeta aetc aetr aett arab arac arae arar arat arau arba arbe arc- arca arce arct area arec aree aret areu arr- arra arrc arre arrr arrt arru arta artc arte artr arua arub arue arut at-t ataa atab atac atae atar atat atca atcc atcr atea atec atee ater atra atrc atre atru atta atte attr attu atua atub atuc atur auaa aube auca auce auct auer aur- aura aure aut- aute baaa baar baat baba babb babe babr babu bac- baca bacc bace bact baer bar- bara barb barc bare barr bart baru bata batc bate batt batu bau- baur bbau bbbb bbeb bbet bbrc bcaa bcar bcat bcbc bcca bccc bcec bcer bcet bcra bcru bctc bcuc bear beat beau beba bebb bebe beca becu beeb beer beet bera berc bere berr bert beru beta betc bete bett betu beur brab brac brae brat brau brca brcb brce brea breb brec bree brer bret brrr brtc bruc brue brut btaa btcc btec btrc btrt bttb buar buat buba bubb bube bubu buca bucc buce bucu buea buer bueu bur- bura burb bure burr burt buru but- buta bute butt caaa caab caac caat caba cabe cabu cac- caca cacc cace cacr caec caer caeu cara carb carc care carr cart cat- cata catb catc cate catt catu cauc caut cbac cbar cbat cbbc cbca cbcc cbce cbcr cbct cbcu cbea cbec cbee cber cbet cbre cbrt cbta cbtc ccaa ccab ccac ccar ccat ccba ccbc ccca cccb cccc cccu ccee ccra ccrc ccre ccrt cctb cctc cctt ccuc ccut ceac cear ceat ceba cebu cec- ceca cece cect ceeb ceec cer- cera cerc cere cert cet- ceta cete crab crac crar crat crau crbc crbu crca crcc crce crcr cre- crea creb crec cree cret creu crrt crtc crub crue crut ctab ctae ctba ctca ctec ctrc ctta cuau cub- cuba cubb cube cuca cucc cuce cuer cura curb cure curr curt cut- cuta cutc cute cutt eaba eaca eacc eaec eara earb eare eart eata eate ebac ebba ebbc ebbr ebcc eber ebru ebur ecaa ecac ecar ecat ecbc ecbe ecca eccb eccc ecce ecct ecra ecrc ecrr ecru ect- ecta ectc ecua eeca eeea eeee eera eerc eeta eetc eete eetu erat erau erba erbb erbe erca ercc erce ereb erec erer eret erra errc erre erta ertu erua erub eruc erur etat etbc etbr etcc etec etee eter etra etre etta ette ettu etua euba eubc euer eur- eura eurc eure eurt raab raat raba rabb rabe rabu rac- raca racc race ract racu raec raer rara rarb rare rata rate ratt ratu raua raub rauc raue raut rbbb rbbr rcac rcbc rccb rccc rcet rctc rea- reac reae rear reat reau reba rebb rebe rebu reca recc rece recr rect recu reeb reet rera rere rert reru reta rete retr rett reue reut reuu rrat rrrr rtca rtcc rtce rtee ruba rubb rube rubu ruca ruce ruct ruer ruet rura rurc rure ruru ruta rute rutt rutu taa- taar taat taba tabb tabc tabe tabu taca tacc tace tact taec taer tara tarb tarc tare tarr tart taru tata tatb tate tatr tatt tatu taua taub tauc taue taur taut tbar tbca tbcb tbcc tbce tbrb tbta tcca tccc tccu tctc