-er a-a a-b a-c a-t aaa aab aac aae aaf aar aat ab- aba abb abc abe abf abr abt ac- aca acb acc ace acf acr act aea aeb aec aee aef aer aet af- afa afb afc afe aff afr aft ar- ara arb arc are arf arr art at- ata atb atc ate atf atr att baa bab bac bae baf bar bat bba bbb bbc bbe bbf bbr bbt bca bcb bcc bce bcf bcr bct be- bea beb bec bee bef ber bet bfa bfb bfc bfe bff bfr bft bra brb bre brf brr brt bta btb btc bte btf btr btt c-- caa cab cac cae caf car cat cba cbb cbc cbe cbf cbr cbt cca ccb ccc cce ccf ccr cct ce- cea ceb cec cee cef cer cet cfa cfb cfc cfe cff cfr cft cra crb crc cre crf crr crt cta ctb ctc cte ctf ctr ctt eaa eab eac eae eaf ear eat eba ebb ebc ebe ebf ebr ebt ec- eca ecb ecc ece ecf ecr ect eea eeb eec eee eef eer eet ef- efa efb efc efe eff efr eft era erb erc ere erf err ert eta etb etc ete etf etr ett faa fab fac fae faf far fat fba fbb fbc fbe fbf fbr fbt fca fcb fcc fce fcf fcr fct fea feb fec fee fef fer fet ffa ffc ffe fff ffr fft fra frb frc fre frf frr frt fta ftb ftc fte ftf ftr ftt ra- raa rab rac rae raf rar rat rba rbb rbc rbe rbf rbr rbt rca rcb rcc rce rcf rcr rct re- rea reb rec ree ref rer ret rfa rfb rfc rfe rff rfr rft rra rrb rrc rrf rrr rrt rta rtb rtc rte rtf rtr rtt taa tab tac tae taf tar tat tba tbb tbc tbe tbf tbr tbt tca tcb tcc tce tcf tcr tct te- tea teb tec tee tef ter tet tfa tfb tfc tfe tff tfr tft tra trb trc tre trf trr trt tta ttb ttc tte ttf ttr ttt

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