-er a-a a-b a-c a-t aaa aab aac aad aae aaf aar aat ab- aba abb abc abd abe abf abr abt ac- aca acb acc acd ace acf acr act ad- ada adb adc add ade adf adr adt aea aeb aec aed aee aef aer aet af- afa afb afc afd afe aff afr aft ar- ara arb arc ard are arf arr art at- ata atb atc atd ate atf atr att baa bab bac bad bae baf bar bat bba bbb bbc bbd bbe bbf bbr bbt bca bcb bcc bcd bce bcf bcr bct bda bdb bdc bdd bde bdf bdr bdt be- bea beb bec bed bee bef ber bet bfa bfb bfc bfd bfe bff bfr bft bra brb brd bre brf brr brt bta btb btc btd bte btf btr btt c-- caa cab cac cad cae caf car cat cba cbb cbc cbd cbe cbf cbr cbt cca ccb ccc ccd cce ccf ccr cct cda cdb cdc cdd cde cdf cdr cdt ce- cea ceb cec ced cee cef cer cet cfa cfb cfc cfd cfe cff cfr cft cra crb crc crd cre crf crr crt cta ctb ctc ctd cte ctf ctr ctt daa dab dac dad dae daf dar dat dba dbb dbc dbd dbe dbf dbr dbt dca dcb dcc dcd dce dcf dcr dct dda ddb ddc ddd dde ddf ddr ddt de- dea deb dec ded dee def der det dfa dfb dfc dfd dfe dff dfr dft dra drb drc drd dre drr drt dta dtb dtc dtd dte dtf dtr dtt eaa eab eac ead eae eaf ear eat eba ebb ebc ebd ebe ebf ebr ebt ec- eca ecb ecc ecd ece ecf ecr ect ed- eda edb edc edd ede edf edr edt eea eeb eec eed eee eef eer eet ef- efa efb efc efd efe eff efr eft era erb erc erd ere erf err ert eta etb etc etd ete etf etr ett faa fab fac fad fae faf far fat fba fbb fbc fbd fbe fbf fbr fbt fca fcb fcc fcd fce fcf fcr fct fda fdb fdc fdd fde fdf fdr fdt fea feb fec fed fee fef fer fet ffa ffc ffd ffe fff ffr fft fra frb frc frd fre frf frr frt fta ftb ftc ftd fte ftf ftr ftt ra- raa rab rac rad rae raf rar rat rba rbb rbc rbd rbe rbf rbr rbt rca rcb rcc rcd rce rcf rcr rct rda rdb rdc rdd rde rdf rdr rdt re- rea reb rec red ree ref rer ret rfa rfb rfc rfd rfe rff rfr rft rra rrb rrc rrd rrf rrr rrt rta rtb rtc rtd rte rtf rtr rtt taa tab tac tad tae taf tar tat tba tbb tbc tbd tbe tbf tbr tbt tca tcb tcc tcd tce tcf tcr tct tda tdb tdc tdd tde tdf tdr tdt te- tea teb tec ted tee tef ter tet tfa tfb tfc tfd tfe tff tfr tft tra trb trc trd tre trf trr trt tta ttb ttc ttd tte ttf ttr ttt

a-be aaaa aaab aaac aaad aaae aaaf aaar aaba aabb aabc aabd aabt aaca aacb aacc aacd aace aacf aacr aact aada aadc aade aadt aaea aaec aafa aafb aafc aafd aaff aara aarc aard aare aart aata aatc aatf aatt abaa abab abac abad abae abaf abar abat abb- abba abbb abbe abbr abbt abca abcb abcc abcd abcf abcr abct abda abec abed abee aber abet abff abra abrc abta ac-t acaa acab acac acad acae acar acat acba acca accc accd acce accf acct acda acdb acdc acde acdf acdt ace- acea acec aced acer acet acfc acfd acfe acft acr- acra acrc acre acrr acta actc acte actf actt adaa adab adac adad adae adar adat adba adbc adcc adda addc addd adde addr adea adeb adee ader adet adfa adfc adra adre adta aeac aeaf aecb aect aede aedt aeer aer- aera aerc aerd aeta aetc aetf aetr aett afaa afad afar afat afca afcb afcc afdb afdc afee afer afet affa affc afft afr- afra afrc afre afta aftc afte arab arac arad arae araf arar arat arba arbe arc- arca arce arct arda ardc arde ardf area arec ared aree aref aret arfa arfb arfc arff arft arr- arra arrc arre arrr arrt arta artc arte artr at-t ataa atab atac atad atae atar atat atca atcc atcf atcr atdt atea atec ated atee atef ater atfb atfc atfe atra atrc atre atta atte attr baaa baad baaf baar baat baba babb babe babr bac- baca bacc bace bact bada badb badd bade badr baed baer bafc baff baft bar- bara barb barc bard bare barf barr bart bata batc bate batf batt bbad bbbb bbdd bbeb bbet bbfc bbrc bcaa bcar bcat bcbc bcca bccc bcda bcde bcec bcer bcet bcfc bcra bctc bd-r bdbc bddc bead beaf bear beat beba bebb bebe beca beda bede beeb beed beef beer beet befa befe beff beft bera berc berd bere berr bert beta betc bete bett bfca bfta bftt brab brac brad brae braf brat brca brcb brce brda brdt brea breb brec bred bree bref brer bret brfc brrr brtc btaa btaf btcc btdt btec btfc btrc btrt bttb c-cd caaa caab caac caaf caat caba cabe cabf cac- caca cacc cace cacr cada cadc cadd cade cadr caec caer cafa cafb cafc cafe caff cara carb carc card care carf carr cart cat- cata catb catc catd cate catf catt cbac cbar cbat cbbc cbca cbcc cbce cbcr cbct cbdb cbdc cbea cbec cbee cbef cber cbet cbfb cbfc cbrd cbre cbrt cbta cbtc cbtf ccaa ccab ccac ccad ccaf ccar ccat ccba ccbc ccca cccb cccc cccf ccdc ccdf ccdr cced ccee ccfa ccfc ccfd ccff ccra ccrc ccre ccrf ccrt cctb cctc cctt cd-e cd-r cdaa cdac cdad cdba cdbf