a-a a-b aaa aab aak aao aap aar aas ab- aba abb abk abo abp abr abs aka akb akk ako akp akr aks aoa aob aok aoo aop aor aos ap- apa apb apk apo app apr aps ar- ara arb ark aro arp arr ars as- asa asb ask aso asp asr ass b-p baa bab bak bao bap bar bas bba bbb bbk bbo bbp bbr bbs bka bkb bkk bko bkp bkr bks boa bob bok boo bop bor bos bpa bpb bpo bpp bpr bps bra brb brk bro brp brr brs bsa bsb bsk bso bsp bsr bss ka- kaa kab kak kao kap kar kas kba kbb kbk kbo kbp kbr kbs kkb kkk kkp kkr kks koa kob kok koo kop kor kos kpa kpk kpo kpp kpr kps kra krk kro krp krr krs ksa ksb ksk kso ksp ksr kss oaa oab oak oao oap oar oas ob- oba obb obk obo obp obr obs oka okb okk oko okp okr oks oo- ooa oob ook ooo oop oor oos op- opa opb opk opo opp opr ops or- ora orb ork oro orp orr ors os- osa osb osk oso osp osr oss p-p paa pab pak pao pap par pas pba pbb pbk pbo pbp pbr pbs pka pkb pko pkp pkr pks poa pob pok poo pop por pos ppa ppb ppk ppo ppp ppr pps pra prb prk pro prp prr prs ps- psa psb psk pso psp psr pss ra- raa rab rak rao rap rar ras rba rbb rbk rbo rbp rbr rbs rkb rkk rko rkp rks roa rob rok roo rop ror ros rpa rpb rpk rpo rpp rpr rps rra rrb rrk rrp rrr rrs rsa rsb rsk rso rsp rsr rss saa sab sak sao sap sar sas sba sbb sbk sbo sbp sbr sbs sk- ska skb skk sko skp skr sks soa sob sok soo sop sor sos spa spb spk spo spp spr sps sr- sra srb srk sro srp srr srs ss- ssa ssb ssk sso ssp ssr sss

a-ak a-ok aaaa aaab aaap aaar aaas aaba aabb aabp aaka aaoo aapa aapo aaps aara aaro aarp aars aasa aass abaa abab abak abap abar abas abb- abba abbb abbo abbr abbs aboa abob abok aboo abor abos abpa abpp abpr abps abra abro abrs abs- absa absp abss akaa akao akap akar akas akka akko akok akos akpo akr- akra aksa aoba aokp aoks aopo aora aorb aors aosp aoss apak apao apap apar apas apba apbr apbs apo- apoo apop apor apos appa appr apps apra apro aprs apsa apso apss arab arak arap arar aras arba arbs arka arko arks aroa arob aroo aror aros arpa arps arr- arra arrk arro arrr arrs ars- arsa arsk arso asaa asab asak asao asap asar asas asba asbo aska asko askr asks asob asok asop asor asos aspa aspo aspr asps asra asro asrs assa assk asso assp assr asss baaa baak baar baas baba babb babo babr babs bak- baka bako bakr baks baos bapa bapp baps bar- bara barb bark baro barr bars basa bask baso bass bbas bbbb bbbs bbpr bkpr bksp boab boak boar boas boba bobb bobo bobs boka boko boks boob book boop boor boos bopa bopp bops bor- bora bork boro borr bors bosa bosk boso boss bpsa brab brak brao bras brka brkb broa brob brok broo bror bros brrr brrs brsb brsr bsaa bsap bsas bsos bspp bspr bsra k-os kaaa kaab kaak kaap kaar kaas kaba kabb kabo kabr kaka kakk kako kaks kaoa kaok kaor kaos kap- kapa kapo kapp kaps kara karb kark karo karp karr kars kas- kasa kasb kask kaso kasp kasr kass kbaa kbab kbak kbap kbar kbas kbba kbbb kbbk kbbo kbbr kbbs kbkb kbkk kbko kbkr kboa kbob kbok kboo kbos kbpa kbpk kbpo kbpr kbps kbra kbrb kbrk kbro kbsa kbsb kbsk kbso kbsr kbss kkaa kkap kkar kkba kkbb kkbo kkbr kkbs kkkk kkoa kkob kkoo kkor kkpk kkps kkrb kkrk kkro kkrr kkrs kksa kksp kksr kkss koab koak koap koar koas koba kobb kobk kobo kobr kobs koka kokb kokk koko kokp kokr koks koob kook kooo koop koor koos kopa kopb kopp kopr kops kora korb kork koro korr kors kos- kosa kosb koso kosp kosr koss kpak kpao kpar kpas kpba kpbb kpbr kpbs kpkk kpkr kpoa kpob kpok kpoo kpop kppk kppo kppp kppr kprb kprk kpro kprp kprr kprs kpso kpsp krab krak krap krar kras krba krbb krbk krbr krka krkk krko krkr krks kroa krob krok kroo krop kror kros krpa krpr krps krrb krrk krro krrr krrs krsa krsk krsr krss ksab ksak ksar ksas ksba ksbp ksbr ksbs kska kskb kskk ksko kskr ksks ksob ksok ksoo ksop ksor ksos kspa kspb kspk kspo kspr ksps ksra ksrb ksro ksrp ksrr ksrs kssa ksso kssr ksss oaks oaps oara oars oass obak obas obba obbo obkb obok obor obos obra obro obsr obss okak okap okas okka okko okok okor okpo okra okro oksa okso ooaa ooak ooba oooo ooos oops oora oosa opap opar opo- opor opos oppa oppo opps opra opsa orab orak orao orar oras orba orbb orbo orbs orka orko oro- orok oror oros orps orra orro orrs orsa orsk orso osak osap osar osas osba osbp osoo osor osos osro ossa ossb osso paak paap paar paas paba paka pako paks paos papa papb papp papr paps par- para park paro parp parr pars pasa pask paso pasp pass pbar pbpa pbpk pbrs pbsa pbsp poak poar poas poba pobo pobs poka poko pook poop poor poos pop- popa popo popp pops pora porb pork poro porr pors posa posb posk poso poss ppap ppar ppoa ppos pppa pppo pppp ppps ppss prao prar pras prbs pro- proa prob proo prop pros prps prrs prsa prso prss psap psas psbr psoa