a-be aaaa aaab aaac aaae aaaf aaar aaba aabb aabc aabt aaca aacb aacc aace aacf aacr aact aaea aaec aafa aafb aafc aaff aara aarc aare aart aata aatc aatf aatt abaa abab abac abae abaf abar abat abb- abba abbb abbe abbr abbt abca abcb abcc abcf abcr abct abec abee aber abet abff abra abrc abta ac-t acaa acab acac acae acar acat acba acca accc acce accf acct ace- acea acec acer acet acfc acfe acft acr- acra acrc acre acrr acta actc acte actf actt aeac aeaf aecb aect aeer aer- aera aerc aeta aetc aetf aetr aett afaa afar afat afca afcb afcc afee afer afet affa affc afft afr- afra afrc afre afta aftc afte arab arac arae araf arar arat arba arbe arc- arca arce arct area arec aree aref aret arfa arfb arfc arff arft arr- arra arrc arre arrr arrt arta artc arte artr at-t ataa atab atac atae atar atat atca atcc atcf atcr atea atec atee atef ater atfb atfc atfe atra atrc atre atta atte attr baaa baaf baar baat baba babb babe babr bac- baca bacc bace bact baer bafc baff baft bar- bara barb barc bare barf barr bart bata batc bate batf batt bbbb bbeb bbet bbfc bbrc bcaa bcar bcat bcbc bcca bccc bcec bcer bcet bcfc bcra bctc beaf bear beat beba bebb bebe beca beeb beef beer beet befa befe beff beft bera berc bere berr bert beta betc bete bett bfca bfta bftt brab brac brae braf brat brca brcb brce brea breb brec bree bref brer bret brfc brrr brtc btaa btaf btcc btec btfc btrc btrt bttb caaa caab caac caaf caat caba cabe cabf cac- caca cacc cace cacr caec caer cafa cafb cafc cafe caff cara carb carc care carf carr cart cat- cata catb catc cate catf catt cbac cbar cbat cbbc cbca cbcc cbce cbcr cbct cbea cbec cbee cbef cber cbet cbfb cbfc cbre cbrt cbta cbtc cbtf ccaa ccab ccac ccaf ccar ccat ccba ccbc ccca cccb cccc cccf ccee ccfa ccfc ccff ccra ccrc ccre ccrf ccrt cctb cctc cctt ceac cear ceat ceba cec- ceca cece cect ceeb ceec cef- cefa cefc cer- cera cerc cere cerf cert cet- ceta cete cfaa cfab cfac cfae cfar cfbc cfbr cfbt cfca cfcb cfcf cffb cffr cfra cfrb cfre cfrt cfta cftc cfte cftr crab crac craf crar crat crbc crca crcc crce crcr cre- crea creb crec cree cret crfc crrt crtc crtf ctab ctae ctba ctca ctcf ctec ctfc ctrc ctta eaaf eaba eaca eacc eaec eafb eara earb eare eart eata eate ebac ebba ebbc ebbr ebcc eber ebfc ecaa ecac ecar ecat ecbc ecbe ecca eccb eccc ecce ecct ecef ecfa ecfc ecfr ecra ecrc ecrf ecrr ect- ecta ectc ectf eeca eeea eeee eefa eefe eera eerc eeta eetc eete efab efbr efca efet effa eft- efta eraf erat erba erbb erbe erca ercc erce ereb erec erer eret erfc erft erra errc erre erta etat etbc etbr etcc etec etee eter etfa etfb etfc etfe etra etre etta ette faaa faac faba fabe faca facc face fact faeb fafa fafc fafe faff fara farb farc fare farr fart fata fatc fate fatf fatt fbar fcab fcar fcat fcba fcca fccf fcra feaf fear feat feba fece fect feeb feer feet fefc fefe feff fera ferb ferc fere ferr fert feta fete fetr fett ffar ffcc ffee ffff ffrr fftf frab frac frae frat frbc frcc frea free fret frfc frta ft-c ftea fter ftfc raab raaf raat raba rabb rabe rac- raca racc race ract raec raef raer rafa rafc rafe raff raft rara rarb rare rarf rata rate ratf ratt rbaf rbbb rbbr rcac rcaf rcbc rccb rccc rcet rcfc rctc rea- reac reae reaf rear reat reba rebb rebe reca recc rece recr rect reeb reef reet refe reff refr reft rera rere rert reta rete retr rett rfae rfef rffc rftc rrat rrfc rrrr rtbf rtca rtcc rtce rtee rtfb rtfc taa- taaf taar taat taba tabb tabc tabe taca tacc tace tact taec taer tafa tafc tafe taff taft tara tarb tarc tare tarf tarr tart tata tatb tate tatr tatt tbaf tbar tbca tbcb tbcc tbce tbrb tbta tcca tccc tcfc tctc teac tear teat teba teca tecr tect teec teef teer teet tefc teff teft ter- tera terc tere terf terr teta tete tetr tett tfae tfca tfeb tfec tftc traa trab trac trae traf trat trca trcc tre- trea trec tree tref tret trfc trfr trra trtc trte trtr ttab ttbb tter ttfa ttfc ttff tttt