a-a a-b a-c aaa aab aac aao aar aas aau ab- aba abb abc abo abr abs abu ac- aca acb acc aco acr acs acu aoa aob aoc aoo aor aos aou ar- ara arb arc aro arr ars aru as- asa asb asc aso asr ass asu au- aua aub auc auo aur aus b-u baa bab bac bao bar bas bau bba bbb bbc bbo bbr bbs bbu bca bcb bcc bco bcr bcs bcu boa bob boc boo bor bos bou bra brb bro brr brs bru bsa bsb bsc bso bsr bss bsu bua bub buc buo bur bus buu c-- caa cab cac cao car cas cau cba cbb cbc cbo cbr cbs cbu cca ccb ccc cco ccr ccs ccu co- coa cob coc coo cor cos cou cra crb crc cro crr crs cru csa csb csc cso csr css csu cua cub cuc cuo cur cus cuu oaa oab oac oao oar oas oau ob- oba obb obc obo obr obs obu oc- oca ocb occ oco ocr ocs ocu oo- ooa oob ooc ooo oor oos or- ora orb orc oro orr ors oru os- osa osb osc oso osr oss osu ou- oua ouc ouo our ous ra- raa rab rac rao rar ras rau rba rbb rbc rbo rbr rbs rbu rca rcb rcc rco rcr rcs rcu roa rob roc roo ror ros rou rra rrb rrc rrr rrs rru rsa rsb rsc rso rsr rss rsu rua rub ruc ruo rur rus ruu saa sab sac sao sar sas sau sba sbb sbc sbo sbr sbs sbu sca scb scc sco scr scs scu soa sob soc soo sor sos sou sr- sra srb src sro srr srs ss- ssa ssb ssc sso ssr sss ssu sua sub suc suo sur sus suu ua- uaa uab uac uao uar uas uau uba ubb ubc ubo ubr ubs ubu uca ucb ucc uco ucr ucs ucu uoa uob uoc uoo uor uos ur- ura urb urc uro urr urs uru usa usb usc uso usr uss usu uua uuc uur uus uuu

-ous aaaa aaab aaac aaar aaas aaba aabb aabc aaca aacb aacc aaco aacr aacs aacu aaoo aara aarc aaro aars aaru aasa aasc aass aasu aaus abaa abab abac abar abas abau abb- abba abbb abbo abbr abbs abca abcb abcc abcr abcs aboa abob aboo abor abos abou abra abrc abro abrs abs- absa abss absu abua abus acaa acab acac acar acas acba acca accc acco accs accu acoa acor acos acou acr- acra acrc acro acrr acrs acsa acsc acss acu- acuo acur acus aoba aoca aocs aora aorb aors aoss aous arab arac arar aras arau arba arbs arc- arca arco arcs aroa arob aroo aror aros arr- arra arrc arro arrr arrs arru ars- arsa arsc arso arsu arua arub asaa asab asac asao asar asas asau asba asbo asbu asc- asca ascb ascc asco ascr asob asoc asor asos asou asra asrc asro asrs asru assa assc asso assr asss assu asub asur asus auaa auca aur- aura auro ausa ausu baaa baar baas baba babb babo babr babs babu bac- baca bacc baco bacs baos bar- bara barb barc baro barr bars baru basa basc baso bass basu bau- baur bbas bbau bbbb bbbs bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccs bcor bcos bcra bcrs bcru bcsa bcsc bcss bcuc boab boac boar boas boba bobb bobo bobs bobu boca boco bocs bocu boob booc boor boos bor- bora boro borr bors boru bosa bosc boso boss bosu boua bour bous brab brac brao bras brau brca brcb broa brob broc broo bror bros brou brrr brrs brsb brsr bruc brus bsaa bsac bsas bscs bsos bsra bssc buar buba bubb bubo bubs bubu buca bucc buco bucs bucu bur- bura burb buro burr burs buru busa busc buss busu buus c-bo caaa caab caac caas caba cabo cabs cabu cac- caca cacc caco cacr caor caos cara carb carc caro carr cars casa casb casc caso casr cass casu cauc cauo 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 ccob ccoc ccra ccrc ccrs ccsa ccss ccuc ccus coas coba cobb cobo cobs cobu coca coco cocu coob coos cor- cora corb corc coro corr cors cosa cosc coso coss coua coub cour cous crab crac crar cras crau crbc crbu crca crcc crcr crob croc croo cror crsa crss crub crus csaa csab csac csao csar csas cscb cscc csco cscr cscs csob csor csos csra csrc csrs cssa cssr csua csur csus cuau cub- cuba cubb cubs cuca cucc cura curb curo curr curs cusa cusb cuso cuss cusu oaau oara oars oasc oass obas obba obbo obor obos obra obro obsr obss obus ocab ocac ocas ocbc occa occc ocos ocra ocro ocrr ocrs ocsa ocur ooaa ooba oocr oooo ooos oora oosa oous orab orac orao orar oras orba orbb orbo orbs orbu orca orco orcs oro- oror oros orra orro orrs orsa orso orsu orub orus osar osas osba osca oscc osco osoo osor osos osro ossa ossb osso ossu ouac oubs oucc our- oura ouro ours ousa ouu- raab raas raba rabb rabo rabs rabu rac- raca racc raco racs racu raob raoc raos rara rarb raro rars rasa rasc raso rass rasu raua raub rauc raus rbbb rbbr rbbs rbss rcac rcas rcbc rcbo rccb rccc rccs rcos rcsa rcsc rcss roab roar roas rob- roba robb robo robs robu roca rocc roco rocs roob roor roos rora rorc roro roru rosa rosc roso ross roua roub rous rras rrrr rsaa rscc rscs rsos rssa rsua ruas ruba rubb rubs rubu ruca rura rurc ruro rurs ruru rusa ruso russ rusu s-os sa-c saab saac saar saas saba sabb sabc sabo sabr sabs sabu saca sacc saco sacr sacs sacu