-er a-a a-b a-c aaa aab aac aae aaf aar aas aau ab- aba abb abc abe abf abr abs abu ac- aca acb acc ace acf acr acs acu aea aeb aec aee aef aer aes aeu af- afa afb afc afe aff afr afs afu ar- ara arb arc are arf arr ars aru as- asa asb asc ase asf asr ass asu au- aua aub auc aue auf aur aus b-u baa bab bac bae baf bar bas bau bba bbb bbc bbe bbf bbr bbs bbu bca bcb bcc bce bcf bcr bcs bcu be- bea beb bec bee bef ber bes beu bfa bfb bfc bfe bff bfr bfs bfu bra brb bre brf brr brs bru bsa bsb bsc bse bsf bsr bss bsu bua bub buc bue buf bur bus buu c-- caa cab cac cae caf car cas cau cba cbb cbc cbe cbf cbr cbs cbu cca ccb ccc cce ccf ccr ccs ccu ce- cea ceb cec cee cef cer ces ceu cfa cfb cfc cfe cff cfr cfs cfu cra crb crc cre crf crr crs cru csa csb csc cse csf csr css csu cua cub cuc cue cuf cur cus cuu eaa eab eac eae eaf ear eas eau eba ebb ebc ebe ebf ebr ebs ebu ec- eca ecb ecc ece ecf ecr ecs ecu eea eeb eec eee eef eer ees ef- efa efb efc efe eff efr efs era erb erc ere erf err ers eru es- esa esb esc ese esf esr ess esu eu- eua eub euc eue euf eur eus faa fab fac fae faf far fas fau fba fbb fbc fbe fbf fbr fbs fbu fca fcb fcc fce fcf fcr fcs fcu fea feb fec fee fef fer fes feu ffa ffc ffe fff ffr ffs ffu fra frb frc fre frf frr frs fru fsa fsb fsc fse fsf fsr fss fsu fua fub fue fuf fur fus fuu ra- raa rab rac rae raf rar ras rau rba rbb rbc rbe rbf rbr rbs rbu rca rcb rcc rce rcf rcr rcs rcu re- rea reb rec ree ref rer res reu rfa rfb rfc rfe rff rfr rfs rfu rra rrb rrc rrf rrr rrs rru rsa rsb rsc rse rsf rsr rss rsu rua rub ruc rue ruf rur rus ruu saa sab sac sae saf sar sas sau sba sbb sbc sbe sbf sbr sbs sbu sca scb scc sce scf scr scs scu se- sea seb sec see sef ser ses seu sfa sfb sfc sfe sff sfr sfs sfu sr- sra srb src sre srf srr srs ss- ssa ssb ssc sse ssf ssr sss ssu sua sub suc sue suf sur sus suu ua- uaa uab uac uae uaf uar uas uau uba ubb ubc ube ubf ubr ubs ubu uca ucb ucc uce ucf ucr ucs ucu uea ueb uec uee uef uer ues ufa ufc ufe uff ufr ufs ufu ur- ura urb urc ure urf urr urs uru usa usb usc use usf usr uss usu uua uuc uue uur uus uuu

-ase a-be a-fu aaaa aaab aaac aaae aaaf aaar aaas aaba aabb aabc aaca aacb aacc aace aacf aacr aacs aacu aaea aaec aaes aafa aafb aafc aaff aara aarc aare aars aaru aasa aasc aase aasf aass aasu aaus abaa abab abac abae abaf abar abas abau abb- abba abbb abbe abbr abbs abca abcb abcc abcf abcr abcs abec abee aber abes abff abra abrc abrs abs- absa abse absf abss absu abua abue abuf abus acaa acab acac acae acar acas acba acca accc acce accf accs accu ace- acea acec acer aces acfc acfe acfs acr- acra acrc acre acrr acrs acsa acsc acse acss acu- acue acuf acur acus aeac aeaf aeas aebs aecb aeer aer- aera aerc aers aesc aess afaa afar afbs afca afcb afcc afcs afcu afee afer afes affa affc affs afr- afra afrc afre afrs afru afsa afsb afsc afua afue afus arab arac arae araf arar aras arau arba arbe arbs arc- arca arce arcs area arec aree aref ares areu arfa arfb arfc arff arfs arfu arr- arra arrc arre arrr arrs arru ars- arsa arsc arse arsu arua arub arue asaa asab asac asae asaf asar asas asau asba asbu asc- asca ascb ascc asce ascr asea asec asee aser ases asfa asra asrc asrs asru assa assc asse assr asss assu asub asue asur asus auaa aube auca auce auer aufc aufe aufs aur- aura aure ausa ause ausu baaa baaf baar baas baba babb babe babr babs babu bac- baca bacc bace bacs baer baes bafc baff bar- bara barb barc bare barf barr bars baru basa basc base basf bass basu bau- bauf baur bbas bbau bbbb bbbs bbeb bbfc bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccs bcec bcer bces bcfc bcra bcrs bcru bcsa bcsc bcss bcuc beaf bear beas beau beba bebb bebe beca becs becu beeb beef beer bees befa befe beff bera berc bere berr bers beru bes- besa bese bess beur bfas bfca bfcs bffs bfsr brab brac brae braf bras brau brca brcb brce brea breb brec bree bref brer bres brfc brfu brrr brrs brsb brsr bruc brue brus bsaa bsac bsas bscs bsea bseb bsec bsee bser bses bsfa bsfc bsff bsfs bsra bssc bsse buar buba bubb bube bubs bubu buca bucc buce bucs bucu buea buer bueu bufc bufe buff bufr bur- bura burb bure burr burs buru busa busc buse buss busu buus caaa caab caac caaf caas caba cabe cabf cabs cabu cac- caca cacc cace cacr caec caer caes caeu cafa cafb cafc cafe caff cafs cafu cara carb carc care carf carr cars casa casb casc case casr cass casu cauc cauf caus cbac cbar cbbc cbbs cbca cbcc cbce cbcr cbcs cbcu cbea cbec cbee cbef cber cbfb cbfc cbre cbsa cbsc cbse