a-a a-b a-c aaa aab aac aad aar aas aau ab- aba abb abc abd abr abs abu ac- aca acb acc acd acr acs acu ad- ada adb adc add adr ads adu ar- ara arb arc ard arr ars aru as- asa asb asc asd asr ass asu au- aua aub auc aud aur aus b-u baa bab bac bad bar bas bau bba bbb bbc bbd bbr bbs bbu bca bcb bcc bcd bcr bcs bcu bda bdb bdc bdd bdr bds bdu bra brb brd brr brs bru bsa bsb bsc bsd bsr bss bsu bua bub buc bud bur bus buu c-- caa cab cac cad car cas cau cba cbb cbc cbd cbr cbs cbu cca ccb ccc ccd ccr ccs ccu cda cdb cdc cdd cdr cds cdu cra crb crc crd crr crs cru csa csb csc csd csr css csu cua cub cuc cud cur cus cuu daa dab dac dad dar das dau dba dbb dbc dbd dbr dbs dbu dca dcb dcc dcd dcr dcs dcu dda ddb ddc ddd ddr dds ddu dra drb drc drd drr drs dru dsa dsb dsc dsd dsr dss dsu dua dub duc dud dur dus ra- raa rab rac rad rar ras rau rba rbb rbc rbd rbr rbs rbu rca rcb rcc rcd rcr rcs rcu rda rdb rdc rdd rdr rds rdu rra rrb rrc rrd rrr rrs rru rsa rsb rsc rsd rsr rss rsu rua rub ruc rud rur rus ruu saa sab sac sad sar sas sau sba sbb sbc sbd sbr sbs sbu sca scb scc scd scr scs scu sda sdb sdc sdd sdr sds sdu sr- sra srb src srd srr srs ss- ssa ssb ssc ssd ssr sss ssu sua sub suc sud sur sus suu ua- uaa uab uac uad uar uas uau uba ubb ubc ubr ubs ubu uca ucb ucc ucd ucr ucs ucu uda udb udc udd udr uds udu ur- ura urb urc urd urr urs uru usa usb usc usd usr uss usu uua uuc uur uus uuu

aaaa aaab aaac aaad aaar aaas aaba aabb aabc aabd aaca aacb aacc aacd aacr aacs aacu aada aadc aads aadu aara aarc aard aars aaru aasa aasc aasd aass aasu aaus abaa abab abac abad abar abas abau abb- abba abbb abbr abbs abca abcb abcc abcd abcr abcs abda abdu abra abrc abrs abs- absa absd abss absu abua abud abus acaa acab acac acad acar acas acba acca accc accd accs accu acda acdb acdc acds acr- acra acrc acrr acrs acsa acsc acsd acss acu- acur acus adaa adab adac adad adar adas adba adbc adcc adcs adda addc addd addr adds addu adra adrs adsa adsr adss adua adub adur arab arac arad arar aras arau arba arbs arc- arca arcs arda ardc ards ardu arr- arra arrc arrr arrs arru ars- arsa arsc arsd arsu arua arub arud asaa asab asac asad asar asas asau asba asbu asc- asca ascb ascc ascr asda asds asra asrc asrs asru assa assc assd assr asss assu asub asud asur asus auaa auca audc aur- aura aurd ausa ausd ausu baaa baad baar baas baba babb babr babs babu bac- baca bacc bacs bada badb badd badr bads badu bar- bara barb barc bard barr bars baru basa basc bass basu bau- baud baur bbad bbas bbau bbbb bbbs bbdd bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccs bcda bcds bcra bcrs bcru bcsa bcsc bcss bcuc bd-r bdbc bddc bdsd brab brac brad bras brau brca brcb brda brds brrr brrs brsb brsr bruc brud brus bsaa bsac bsas bsbd bscs bsra bsrd bssc bssd buad buar buba bubb bubs bubu buca bucc bucs bucu buda budb budd buds budu bur- bura burb burd burr burs buru busa busc buss busu buus c-cd caaa caab caac caas caba cabs cabu cac- caca cacc cacr cada cadc cadd cadr cads cadu cara carb carc card carr cars casa casb casc casd casr cass casu cauc caus cbac cbar cbbc cbbs cbca cbcc cbcr cbcs cbcu cbdb cbdc cbds cbrd cbsa cbsc cbus ccaa ccab ccac ccad ccar ccas ccba ccbc ccca cccb cccc cccs cccu ccdc ccdr ccds ccra ccrc ccrs ccsa ccsd ccss ccuc ccus cd-r cdaa cdac cdad cdba cdcs cdda cddb cddr cdrs cdss crab crac crar cras crau crbc crbu crca crcc crcr crda crdc crsa crss crub crud crus csaa csab csac csar csas cscb cscc cscd cscr cscs csda csdb csdr csra csrc csrd csrs cssa cssd cssr csua csur csus cuau cub- cuba cubb cubs cuca cucc cuda cuds cura curb curd curr curs cusa cusb cusd cuss cusu daab daad daar daas daau daba dabb dabs dabu daca dacs dada dads dadu dara darb darc dard darr dars daru dasa dasb dasc dasd dass daub daud daur daus dbar dbas dbcc dbcs dbrs dbsa dbss dbus dcas dcbc dcca dccb dccc dccs dccu dcdb dcds dcra dcsc dcss dddd ddrc ddss ddub draa drab drac drad drar dras drau drba drbc drca drda drra drrs drsa drua drub drus druu dsac dsba dsbc dscc dscr dscs dsda dsdr dsrc dsrr dssa dssc duaa duab duad duar duas dub- duba dubb dubc dubs dubu duca ducs duda dudd duds dudu dura duru dusa duur raab raad raas raba rabb rabs rabu rac- raca racc racs racu rada radc radd radr rads radu rara rarb rars rasa rasc rasd rass rasu raua raub rauc raud raus rbbb rbbr rbbs rbds rbsd rbss rcac rcas rcbc rccb rccc rccs rcdc rcds rcrd rcsa rcsc rcsd rcss rdac rdas rrad rras rrrr rsaa rscc rscs rsdd rsds rssa rsua ruad ruas ruba rubb rubs rubu ruca ruda rudd ruds rura rurc rurd rurs ruru rusa russ rusu ruud sa-c saab saac saad saar saas saba sabb sabc sabr sabs sabu saca sacc sacd sacr sacs sacu sada sadb sadc sadd