-er a-a a-b a-c a-t aaa aab aac aae aaf aar aat aau ab- aba abb abc abe abf abr abt abu ac- aca acb acc ace acf acr act acu aea aeb aec aee aef aer aet aeu af- afa afb afc afe aff afr aft afu ar- ara arb arc are arf arr art aru at- ata atb atc ate atf atr att atu au- aua aub auc aue auf aur aut b-u baa bab bac bae baf bar bat bau bba bbb bbc bbe bbf bbr bbt bbu bca bcb bcc bce bcf bcr bct bcu be- bea beb bec bee bef ber bet beu bfa bfb bfc bfe bff bfr bft bfu bra brb bre brf brr brt bru bta btb btc bte btf btr btt btu bua bub buc bue buf bur but buu c-- caa cab cac cae caf car cat cau cba cbb cbc cbe cbf cbr cbt cbu cca ccb ccc cce ccf ccr cct ccu ce- cea ceb cec cee cef cer cet ceu cfa cfb cfc cfe cff cfr cft cfu cra crb crc cre crf crr crt cru cta ctb ctc cte ctf ctr ctt ctu cua cub cuc cue cuf cur cut cuu eaa eab eac eae eaf ear eat eau eba ebb ebc ebe ebf ebr ebt ebu ec- eca ecb ecc ece ecf ecr ect ecu eea eeb eec eee eef eer eet ef- efa efb efc efe eff efr eft era erb erc ere erf err ert eru eta etb etc ete etf etr ett etu eu- eua eub euc eue euf eur eut faa fab fac fae faf far fat fau fba fbb fbc fbe fbf fbr fbt fbu fca fcb fcc fce fcf fcr fct fcu fea feb fec fee fef fer fet feu ffa ffc ffe fff ffr fft ffu fra frb frc fre frf frr frt fru fta ftb ftc fte ftf ftr ftt ftu fua fub fue fuf fur fut fuu ra- raa rab rac rae raf rar rat rau rba rbb rbc rbe rbf rbr rbt rbu rca rcb rcc rce rcf rcr rct rcu re- rea reb rec ree ref rer ret reu rfa rfb rfc rfe rff rfr rft rfu rra rrb rrc rrf rrr rrt rru rta rtb rtc rte rtf rtr rtt rtu rua rub ruc rue ruf rur rut ruu taa tab tac tae taf tar tat tau tba tbb tbc tbe tbf tbr tbt tbu tca tcb tcc tce tcf tcr tct tcu te- tea teb tec tee tef ter tet teu tfa tfb tfc tfe tff tfr tft tfu tra trb trc tre trf trr trt tru tta ttb ttc tte ttf ttr ttt ttu tua tub tuc tue tuf tur tut tuu ua- uaa uab uac uae uaf uar uat uau uba ubb ubc ube ubf ubr ubt ubu uca ucb ucc uce ucf ucr uct ucu uea ueb uec uee uef uer uet ufa ufc ufe uff ufr uft ufu ur- ura urb urc ure urf urr urt uru uta utb utc ute utf utr utt utu uua uuc uue uur uut uuu

a-be a-fu aaaa aaab aaac aaae aaaf aaar aaba aabb aabc aabt aaca aacb aacc aace aacf aacr aact aacu aaea aaec aafa aafb aafc aaff aara aarc aare aart aaru aata aatc aatf aatt abaa abab abac abae abaf abar abat abau abb- abba abbb abbe abbr abbt abca abcb abcc abcf abcr abct abec abee aber abet abff abra abrc abta abtu abua abue abuf abut ac-t acaa acab acac acae acar acat acba acca accc acce accf acct accu ace- acea acec acer acet acfc acfe acft acr- acra acrc acre acrr acta actc acte actf actt actu acu- acue acuf acur acut aeac aeaf aecb aect aeer aer- aera aerc aeta aetc aetf aetr aett afaa afar afat afca afcb afcc afcu afee afer afet affa affc afft afr- afra afrc afre afru afta aftc afte afua afue arab arac arae araf arar arat arau arba arbe arc- arca arce arct area arec aree aref aret areu arfa arfb arfc arff arft arfu 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 atcf atcr atea atec atee atef ater atfb atfc atfe atra atrc atre atru atta atte attr attu atua atub atuc atur auaa aube auca auce auct auer aufc aufe aur- aura aure aut- aute baaa baaf baar baat baba babb babe babr babu bac- baca bacc bace bact baer bafc baff baft bar- bara barb barc bare barf barr bart baru bata batc bate batf batt batu bau- bauf baur bbau bbbb bbeb bbet bbfc bbrc bcaa bcar bcat bcbc bcca bccc bcec bcer bcet bcfc bcra bcru bctc bcuc beaf bear beat beau beba bebb bebe beca becu beeb beef beer beet befa befe beff beft bera berc bere berr bert beru beta betc bete bett betu beur bfca bfta bftt brab brac brae braf brat brau brca brcb brce brea breb brec bree bref brer bret brfc brfu brrr brtc bruc brue brut btaa btaf btcc btec btfc btrc btrt bttb buar buat buba bubb bube bubu buca bucc buce bucu buea buer bueu bufc bufe buff bufr bur- bura burb bure burr burt buru but- buta bute butt caaa caab caac caaf caat caba cabe cabf cabu cac- caca cacc cace cacr caec caer caeu cafa cafb cafc cafe caff cafu cara carb carc care carf carr cart cat- cata catb catc cate catf catt catu cauc cauf caut cbac cbar cbat cbbc cbca cbcc cbce cbcr cbct cbcu 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 cccu ccee ccfa ccfc ccff ccra ccrc ccre ccrf ccrt cctb cctc cctt ccuc ccut ceac cear ceat ceba cebu cec- ceca cece cect ceeb ceec cef- cefa