-er a-a a-b a-c aaa aab aac aae aaf aar aas ab- aba abb abc abe abf abr abs ac- aca acb acc ace acf acr acs aea aeb aec aee aef aer aes af- afa afb afc afe aff afr afs ar- ara arb arc are arf arr ars as- asa asb asc ase asf asr ass baa bab bac bae baf bar bas bba bbb bbc bbe bbf bbr bbs bca bcb bcc bce bcf bcr bcs be- bea beb bec bee bef ber bes bfa bfb bfc bfe bff bfr bfs bra brb bre brf brr brs bsa bsb bsc bse bsf bsr bss c-- caa cab cac cae caf car cas cba cbb cbc cbe cbf cbr cbs cca ccb ccc cce ccf ccr ccs ce- cea ceb cec cee cef cer ces cfa cfb cfc cfe cff cfr cfs cra crb crc cre crf crr crs csa csb csc cse csf csr css eaa eab eac eae eaf ear eas eba ebb ebc ebe ebf ebr ebs ec- eca ecb ecc ece ecf ecr ecs eea eeb eec eee eef eer ees ef- efa efb efc efe eff efr efs era erb erc ere erf err ers es- esa esb esc ese esf esr ess faa fab fac fae faf far fas fba fbb fbc fbe fbf fbr fbs fca fcb fcc fce fcf fcr fcs fea feb fec fee fef fer fes ffa ffc ffe fff ffr ffs fra frb frc fre frf frr frs fsa fsb fsc fse fsf fsr fss ra- raa rab rac rae raf rar ras rba rbb rbc rbe rbf rbr rbs rca rcb rcc rce rcf rcr rcs re- rea reb rec ree ref rer res rfa rfb rfc rfe rff rfr rfs rra rrb rrc rrf rrr rrs rsa rsb rsc rse rsf rsr rss saa sab sac sae saf sar sas sba sbb sbc sbe sbf sbr sbs sca scb scc sce scf scr scs se- sea seb sec see sef ser ses sfa sfb sfc sfe sff sfr sfs sr- sra srb src sre srf srr srs ss- ssa ssb ssc sse ssf ssr sss

-ase a-be aaaa aaab aaac aaae aaaf aaar aaas aaba aabb aabc aaca aacb aacc aace aacf aacr aacs aaea aaec aaes aafa aafb aafc aaff aara aarc aare aars aasa aasc aase aasf aass abaa abab abac abae abaf abar abas 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 acaa acab acac acae acar acas acba acca accc acce accf accs ace- acea acec acer aces acfc acfe acfs acr- acra acrc acre acrr acrs acsa acsc acse acss aeac aeaf aeas aebs aecb aeer aer- aera aerc aers aesc aess afaa afar afbs afca afcb afcc afcs afee afer afes affa affc affs afr- afra afrc afre afrs afsa afsb afsc arab arac arae araf arar aras arba arbe arbs arc- arca arce arcs area arec aree aref ares arfa arfb arfc arff arfs arr- arra arrc arre arrr arrs ars- arsa arsc arse asaa asab asac asae asaf asar asas asba asc- asca ascb ascc asce ascr asea asec asee aser ases asfa asra asrc asrs assa assc asse assr asss baaa baaf baar baas baba babb babe babr babs bac- baca bacc bace bacs baer baes bafc baff bar- bara barb barc bare barf barr bars basa basc base basf bass bbas bbbb bbbs bbeb bbfc bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccs bcec bcer bces bcfc bcra bcrs bcsa bcsc bcss beaf bear beas beba bebb bebe beca becs beeb beef beer bees befa befe beff bera berc bere berr bers bes- besa bese bess bfas bfca bfcs bffs bfsr brab brac brae braf bras brca brcb brce brea breb brec bree bref brer bres brfc brrr brrs brsb brsr bsaa bsac bsas bscs bsea bseb bsec bsee bser bses bsfa bsfc bsff bsfs bsra bssc bsse caaa caab caac caaf caas caba cabe cabf cabs cac- caca cacc cace cacr caec caer caes cafa cafb cafc cafe caff cafs cara carb carc care carf carr cars casa casb casc case casr cass cbac cbar cbbc cbbs cbca cbcc cbce cbcr cbcs cbea cbec cbee cbef cber cbfb cbfc cbre cbsa cbsc cbse ccaa ccab ccac ccaf ccar ccas ccba ccbc ccca cccb cccc cccf cccs ccee ccfa ccfc ccff ccra ccrc ccre ccrf ccrs ccsa ccsf ccss ceac cear ceas ceba cebs cec- ceca cece cecs ceeb ceec cees cef- cefa cefc cer- cera cerc cere cerf cers cesa cesc cese cesr cess cfaa cfab cfac cfae cfar cfbc cfbr cfbs cfca cfcb cfcf cfcs cffb cffr cfra cfrb cfre cfsa cfse crab crac craf crar cras crbc crca crcc crce crcr cre- crea creb crec cree cres crfc crfs crsa crss csaa csab csac csar csas csbf cscb cscc csce cscf cscr cscs csea csec csee cser csfc csfr csra csrc csrs cssa csse cssr eaaf eaba eaca eacc eaec eafb eara earb eare ears easa ease ebac ebba ebbc ebbr ebbs ebcc eber ebes ebfc ebsa ecaa ecac ecar ecbc ecbe ecca eccb eccc ecce ecef eces ecfa ecfc ecfr ecfs ecra ecrc ecrf ecrr ecsa ecsc ecse ecss eeca eecs eeea eeee eees eefa eefe eera eerc eers eese efab efas efbr efca efes effa effs efsa eraf eras erba erbb erbe erca ercc erce ereb erec erer eres erfc erfs erra errc erre errs ersa erse esab esac esar esas esba esbs esca escb esce escr escs esea esee eser eses esfs esra essa esse faaa faac faas faba fabe fabs faca facc face facs faeb faes fafa fafc fafe faff fara farb farc fare farr fars fasa fasc fase fass fbar fbrs fcab fcar fcas fcba fcbs fcca fccf fces fcra fcsc feaf fear feas feba febs fece feeb feer fees fefc fefe feff fera ferb ferc fere ferr fers