a-a a-b a-c aaa aab aac aan aao aar aas ab- aba abb abc abn abo abr abs ac- aca acb acc acn aco acr acs an- ana anb anc ann ano anr ans aoa aob aoc aon aoo aor aos ar- ara arb arc arn aro arr ars as- asa asb asc asn aso asr ass baa bab bac ban bao bar bas bba bbb bbc bbn bbo bbr bbs bca bcb bcc bcn bco bcr bcs bna bnb bnc bnn bno bnr bns boa bob boc bon boo bor bos bra brb brn bro brr brs bsa bsb bsc bsn bso bsr bss c-- caa cab cac can cao car cas cba cbb cbc cbn cbo cbr cbs cca ccb ccc ccn cco ccr ccs cn- cna cnb cnc cnn cno cnr cns co- coa cob coc con coo cor cos cra crb crc crn cro crr crs csa csb csc csn cso csr css naa nab nac nan nao nar nas nba nbb nbc nbn nbo nbr nbs nca ncb ncc ncn nco ncr ncs nna nnb nnc nnn nno nns no- noa nob noc non noo nor nos nra nrb nrc nrn nro nrr nrs nsa nsb nsc nsn nso nsr nss oaa oab oac oan oao oar oas ob- oba obb obc obn obo obr obs oc- oca ocb occ ocn oco ocr ocs on- ona onb onc onn ono onr ons oo- ooa oob ooc oon ooo oor oos or- ora orb orc orn oro orr ors os- osa osb osc osn oso osr oss ra- raa rab rac ran rao rar ras rba rbb rbc rbn rbo rbr rbs rca rcb rcc rcn rco rcr rcs rna rnb rnc rnn rno rnr rns roa rob roc ron roo ror ros rra rrb rrc rrn rrr rrs rsa rsb rsc rsn rso rsr rss saa sab sac san sao sar sas sba sbb sbc sbn sbo sbr sbs sca scb scc scn sco scr scs sna snb snc snn sno snr sns soa sob soc son soo sor sos sr- sra srb src srn sro srr srs ss- ssa ssb ssc ssn sso ssr sss

-ana aaaa aaab aaac aaan aaar aaas aaba aabb aabc aaca aacb aacc aacn aaco aacr aacs aana aaon aaoo aara aarc aaro aars aasa aasc aass abaa abab abac aban abar abas abb- abba abbb abbo abbr abbs abca abcb abcc abcn abcr abcs aboa abob abon aboo abor abos abra abrc abro abrs abs- absa abss acaa acab acac acan acar acas acba acca accc acco accs acoa acon acor acos acr- acra acrc acro acrr acrs acsa acsc acss ana- anaa anab anac anan anao anar anas anba anbb anbo anca ancc anco anna annb anno anns ano- anoa anon anor anos anrc ansa anso aoba aoca aocs aonb aono aora aorb aorn aors aoss arab arac aran arar aras arba arbs arc- arca arco arcs arna arno arns aroa arob aron aroo aror aros arr- arra arrc arro arrr arrs ars- arsa arsc arso asaa asab asac asan asao asar asas asba asbo asc- asca ascb ascc asco ascr asnc asno asob asoc ason asor asos asra asrc asro asrs assa assc assn asso assr asss baaa baan baar baas baba babb babo babr babs bac- baca bacc bacn baco bacs bana banc bann bano banr bans baon baos bar- bara barb barc barn baro barr bars basa basc baso bass bbas bbbb bbbs bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccs bcor bcos bcra bcrs bcsa bcsc bcsn bcss bnas bnoc bnor bnrr bnss boab boac boan boar boas boba bobb bobo bobs boca boco bocs bona bonc bonn bono bons boob booc boon boor boos bor- bora born boro borr bors bosa bosc bosn boso boss brab brac bran brao bras brca brcb brna brno brns broa brob broc bron broo bror bros brrr brrs brsb brsr bsaa bsac bsas bscs bsns bson bsos bsra bssc c-bo caaa caab caac caan caas caba cabo cabs cac- caca cacc caco cacr cana canc cann cano cans caor caos cara carb carc carn caro carr cars casa casb casc caso casr cass cbac cbar cbbc cbbs cbca cbcc cbcn cbcr cbcs cbna cbrn cbsa cbsc cbsn ccaa ccab ccac ccar ccas ccba ccbc ccbn ccca cccb cccc cccs ccna ccnb ccnc ccnr ccns ccob ccoc ccra ccrc ccrs ccsa ccsn ccss cnaa cnac cnas cnbc cnco cnna cnrc cnrr cnsa cnss coan coas coba cobb cobo cobs coca coco con- cona conc conn cono cons coob coon coos cor- cora corb corc corn coro corr cors cosa cosc coso coss crab crac cran crar cras crbc crca crcc crcr crna crns crob croc cron croo cror crsa crss csaa csab csac csao csar csas cscb cscc csco cscr cscs csob csor csos csra csrc csrs cssa cssr naaa naab naac naan naar naas naba nabc nabo nabs naca nacc naco nacs nan- nana nanb nann nano nans naoc naor naos nara narc narn naro narr nars nas- nasa nasb nasc naso nasr nass nbaa nbar nbas nbbc nbbo nbca nbcc nbco nbcs ncaa ncac ncar ncba ncbc ncbs ncca nccc nccn nccr nccs ncna ncnc ncoa ncoc ncor ncos ncra ncrc ncsa ncsc ncss nnnn nnos nnsa nnss noaa noac noba nobc nobo nobs noco nocs non- nona nonn nono nons noo- noob noon nooo noor noos nor- nora norb norc norn noro norr nors nos- nosa noss nrab nras nrca nrcs nrna nroc nron nrrc nrsa nrsc nsaa nsac nsar nsbo nsca nscc nscs nsna nsnr nsos nsra nsrc nssa nssb nssc nsso nssr nsss oara oars oasc oass oban obas obba obbo obon obor obos obra obro obsn obsr obss ocab ocac ocan ocas ocbc occa occc occn ocna ocon ocos ocra ocro ocrr ocrs ocsa onab onan onar onas onc- onca onco onna onno onon onor onos onra onsc onso ooaa ooba oocr oona oons oooo ooos oora oosa orab orac