a-a a-b a-c aaa aab aac aao aap aar aas ab- aba abb abc abo abp abr abs ac- aca acb acc aco acp acr acs aoa aob aoc aoo aop aor aos ap- apa apb apc apo app apr aps ar- ara arb arc aro arp arr ars as- asa asb asc aso asp asr ass b-p baa bab bac bao bap bar bas bba bbb bbc bbo bbp bbr bbs bca bcb bcc bco bcp bcr bcs boa bob boc boo bop bor bos bpa bpb bpc bpo bpp bpr bps bra brb bro brp brr brs bsa bsb bsc bso bsp bsr bss c-- caa cab cac cao cap car cas cba cbb cbc cbo cbp cbr cbs cca ccb ccc cco ccp ccr ccs co- coa cob coc coo cop cor cos cpa cpb cpc cpo cpp cpr cps cra crb crc cro crp crr crs csa csb csc cso csp csr css oaa oab oac oao oap oar oas ob- oba obb obc obo obp obr obs oc- oca ocb occ oco ocp ocr ocs oo- ooa oob ooc ooo oop oor oos op- opa opb opc opo opp opr ops or- ora orb orc oro orp orr ors os- osa osb osc oso osp osr oss p-p paa pab pac pao pap par pas pba pbb pbc pbo pbp pbr pbs pca pcb pcc pco pcp pcr pcs poa pob poc poo pop por pos ppa ppb ppc ppo ppp ppr pps pra prb prc pro prp prr prs ps- psa psb psc pso psp psr pss ra- raa rab rac rao rap rar ras rba rbb rbc rbo rbp rbr rbs rca rcb rcc rco rcp rcr rcs roa rob roc roo rop ror ros rpa rpb rpc rpo rpp rpr rps rra rrb rrc rrp rrr rrs rsa rsb rsc rso rsp rsr rss saa sab sac sao sap sar sas sba sbb sbc sbo sbp sbr sbs sca scb scc sco scp scr scs soa sob soc soo sop sor sos spa spb spc spo spp spr sps sr- sra srb src sro srp srr srs ss- ssa ssb ssc sso ssp ssr sss

aaaa aaab aaac aaap aaar aaas aaba aabb aabc aabp aaca aacb aacc aaco aacp aacr aacs aaoo aapa aapc aapo aaps aara aarc aaro aarp aars aasa aasc aass abaa abab abac abap abar abas abb- abba abbb abbo abbr abbs abca abcb abcc abcp abcr abcs aboa abob aboo abor abos abpa abpc abpp abpr abps abra abrc abro abrs abs- absa absp abss acaa acab acac acap acar acas acba acca accc acco accp accs acoa acop acor acos acpa acpr acps acr- acra acrc acro acrr acrs acsa acsc acss aoba aoca aocs aopo aora aorb aors aosp aoss apac apao apap apar apas apba apbr apbs apca apcb apcc apco apcr apcs apo- apoc apoo apop apor apos appa appc appr apps apra aprc apro aprs apsa apso apss arab arac arap arar aras arba arbs arc- arca arco arcs aroa arob aroo aror aros arpa arps arr- arra arrc arro arrr arrs ars- arsa arsc arso asaa asab asac asao asap asar asas asba asbo asc- asca ascb ascc asco ascp ascr asob asoc asop asor asos aspa aspc aspo aspr asps asra asrc asro asrs assa assc asso assp assr asss baaa baar baas baba babb babo babr babs bac- baca bacc baco bacs baos bapa bapc bapp baps bar- bara barb barc baro barr bars basa basc baso bass bbas bbbb bbbs bbpr bbrc bcaa bcap bcar bcas bcbc bcbp bcbs bcca bccc bccs bcor bcos bcpp bcps bcra bcrs bcsa bcsc bcss boab boac boar boas boba bobb bobo bobs boca boco bocs boob booc boop boor boos bopa bopp bops bor- bora boro borr bors bosa bosc boso boss bpcp bprc bpsa brab brac brao bras brca brcb broa brob broc broo bror bros brrr brrs brsb brsr bsaa bsac bsap bsas bscp bscs bsos bspp bspr bsra bssc c-bo caaa caab caac caap caas caba cabo cabs cac- caca cacc caco cacr caor caos capa capb capc capo capp caps cara carb carc caro carp carr cars casa casb casc caso casp casr cass cbac cbar cbbc cbbs cbca cbcc cbcp cbcr cbcs cbpc cbpp cbsa cbsc ccaa ccab ccac ccap ccar ccas ccba ccbc ccca cccb cccc cccp cccs ccob ccoc ccpa ccpp ccpr ccps ccra ccrc ccrp ccrs ccsa ccsp ccss coas coba cobb cobo cobs coca coco cocp coob coop coos copa copo copp copr cops cor- cora corb corc coro corp corr cors cosa cosc coso cosp coss cpaa cpac cpap cpas cpbc cpca cpcs cpos cppa cpps cprs cpsa cpsc cpso cpsr crab crac crap crar cras crbc crca crcc crcr crob croc croo crop cror crpc crps crsa crsp crss csaa csab csac csao csar csas cscb cscc csco cscr cscs csob csor csos cspa cspb cspc csps csra csrc csrs cssa cssr oaps oara oars oasc oass obas obba obbo obor obos obra obro obsr obss ocab ocac ocap ocas ocbc occa occc ocos ocpa ocpp ocra ocro ocrr ocrs ocsa ooaa ooba oocr oooo ooos oops oora oosa opap opar opca opo- opor opos oppa oppo opps opra opsa orab orac orao orar oras orba orbb orbo orbs orca orco orcs oro- oror oros orpc orps orra orro orrs orsa orso osap osar osas osba osbp osca oscc osco osoo osor osos osro ossa ossb osso paap paar paas paba paca paco pacs paoc paos papa papb papp papr paps par- para parc paro parp parr pars pasa pasc paso pasp pass pbac pbar pbcc pboc pbpa pbrs pbsa pbsp pcaa pcap pcas pcba pcbc pcbs pcca pccc pccs pcoa pcos pcpb pcpp pcps pcra pcrc pcsa pcso poar poas poba pobo pobs poca poco pocs poop poor poos pop- popa popc popo popp pops pora porb porc poro porr pors posa posb poso poss ppac ppap ppar