a-a a-b a-c aaa aab aac aar aas aau ab- aba abb abc abr abs abu ac- aca acb acc acr acs acu ar- ara arb arc arr ars aru as- asa asb asc asr ass asu au- aua aub auc aur aus b-u baa bab bac bar bas bau bba bbb bbc bbr bbs bbu bca bcb bcc bcr bcs bcu bra brb brr brs bru bsa bsb bsc bsr bss bsu bua bub buc bur bus buu c-- caa cab cac car cas cau cba cbb cbc cbr cbs cbu cca ccb ccc ccr ccs ccu cra crb crc crr crs cru csa csb csc csr css csu cua cub cuc cur cus cuu ra- raa rab rac rar ras rau rba rbb rbc rbr rbs rbu rca rcb rcc rcr rcs rcu rra rrb rrc rrr rrs rru rsa rsb rsc rsr rss rsu rua rub ruc rur rus ruu saa sab sac sar sas sau sba sbb sbc sbr sbs sbu sca scb scc scr scs scu sr- sra srb src srr srs ss- ssa ssb ssc ssr sss ssu sua sub suc sur sus suu ua- uaa uab uac uar uas uau uba ubb ubc ubr ubs ubu uca ucb ucc ucr ucs ucu ur- ura urb urc urr urs uru usa usb usc usr uss usu uua uuc uur uus uuu

aaaa aaab aaac aaar aaas aaba aabb aabc aaca aacb aacc aacr aacs aacu aara aarc aars aaru aasa aasc aass aasu aaus abaa abab abac abar abas abau abb- abba abbb abbr abbs abca abcb abcc abcr abcs abra abrc abrs abs- absa abss absu abua abus acaa acab acac acar acas acba acca accc accs accu acr- acra acrc acrr acrs acsa acsc acss acu- acur acus arab arac arar aras arau arba arbs arc- arca arcs arr- arra arrc arrr arrs arru ars- arsa arsc arsu arua arub asaa asab asac asar asas asau asba asbu asc- asca ascb ascc ascr asra asrc asrs asru assa assc assr asss assu asub asur asus auaa auca aur- aura ausa ausu baaa baar baas baba babb babr babs babu bac- baca bacc bacs bar- bara barb barc barr bars baru basa basc bass basu bau- baur bbas bbau bbbb bbbs bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccs bcra bcrs bcru bcsa bcsc bcss bcuc brab brac bras brau brca brcb brrr brrs brsb brsr bruc brus bsaa bsac bsas bscs bsra bssc buar buba bubb bubs bubu buca bucc bucs bucu bur- bura burb burr burs buru busa busc buss busu buus caaa caab caac caas caba cabs cabu cac- caca cacc cacr cara carb carc carr cars casa casb casc casr cass casu cauc caus cbac cbar cbbc cbbs cbca cbcc cbcr cbcs cbcu cbsa cbsc cbus ccaa ccab ccac ccar ccas ccba ccbc ccca cccb cccc cccs cccu ccra ccrc ccrs ccsa ccss ccuc ccus crab crac crar cras crau crbc crbu crca crcc crcr crsa crss crub crus csaa csab csac csar csas cscb cscc cscr cscs csra csrc csrs cssa cssr csua csur csus cuau cub- cuba cubb cubs cuca cucc cura curb curr curs cusa cusb cuss cusu raab raas raba rabb rabs rabu rac- raca racc racs racu rara rarb rars rasa rasc rass rasu raua raub rauc raus rbbb rbbr rbbs rbss rcac rcas rcbc rccb rccc rccs rcsa rcsc rcss rras rrrr rsaa rscc rscs rssa rsua ruas ruba rubb rubs rubu ruca rura rurc rurs ruru rusa russ rusu sa-c saab saac saar saas saba sabb sabc sabr sabs sabu saca sacc sacr sacs sacu sara sarc sarr sars saru sasa sasc sass saua sauc saur saus sbaa sbac sbar sbas sbbs sbca sbcc sbcs sbsa sbus scaa scab scac scar scas scba sccc sccs scr- scra scrc scrs scsa scsc scsr scsu scua scub scur sras srbc srcc srub ssaa ssab ssac ssas ssau ssbr ssca sscc sscs ssra ssrc ssrs sssa sssb sssc ssss suar suas sub- suba subb subs suc- succ sucr sucs sur- sura surc surr surs suru sus- susa suss susu suus uabc uaca uarc uars uaru uasa uaua ubac ubar ubba ubra ucar ucas ucbc ucca ucrc ucsa ucsb ucsc ucsu ucua urac uras urau urba urbs urca urra ursa urss ursu urur urus us-a usaa usac usar usas usba usbc usbr usbs usca uscc uscs usra ussa ussb ussc ussr usss ussu usua usus uuuu

-aaa- aaaas aaarc aaasa aaass aabaa aabba aabra aacbc aacsa aacsb aacss aacus aarau aasra abaab ababa ababs ababu abaca abacs abara abaru abasa abass abbac abbar abbas abbrs abbur abcas abccc abrac abrar abras abrus absar abura aburr acaca acacb acar- acara acars acass acaua accas accra accub accur accus acrab acuba acura acusa ar-ab ara-c arab- araba arabs araca arara arars araru arass arasu arbab arbar arbas arbus arcas arcus arras arrau arrua arsac aruaa aruac aruba arura aruru arus- arusa asaba asabc asara asasa asbca asbru ascar ascus asrar assab assac assas assur asubs asura auass aubas aucas aurar auras aurra ausar ausra aussa b-cas baars babar babas babau babbs babra babur babus bacab bacar bacas bacca bacu baraa barab barac barar baras barba barbs barbu barca barcs barra barrs barru barsa barss barua baruc barus basab basar basca basra bassa bassu baura bauru bbsrc bbuss braas braca bracc bracs brasa brasc brass brrar brrrr brusa bruss bsaba bubas bubba bucca bucsa bucsu bucur buraa buras burbs burca burcu burra burrs burru bursa buruc burus busaa busca busra bussa bussu busua busur busuu c-a-c c-bus ca-ca caaba cabas cabra cabus cacas cacau cacu cacus caraa carab carac caras carau carb- carbs carra carrs carus casar casas casca casus cauac cauas cauca caurs causa cbars ccass ccccc craba crabb crabs crars crass cruas crura csaba csars cssra cuaba cubas cubra cubub curac curar curas curau curbs currs cursa curua ra-ra raaba raasa rabab rabac rabas rabba racsa rarus rasac rasar rasas rasau rasca rasra rassa rausu rccar