a-a a-b aaa aab aak aao aar aas aav ab- aba abb abk abo abr abs abv aka akb akk ako akr aks akv aoa aob aok aoo aor aos aov ar- ara arb ark aro arr ars arv as- asa asb ask aso asr ass asv av- ava avb avk avo avr avs baa bab bak bao bar bas bav bba bbb bbk bbo bbr bbs bka bkb bkk bko bkr bks bkv boa bob bok boo bor bos bov bra brb brk bro brr brs brv bsa bsb bsk bso bsr bss bsv bva bvb bvk bvo bvr bvs bvv ka- kaa kab kak kao kar kas kav kba kbb kbk kbo kbr kbs kkb kkk kkr kks kkv koa kob kok koo kor kos kra krk kro krr krs krv ksa ksb ksk kso ksr kss ksv kva kvb kvk kvo kvr kvs kvv oaa oab oak oao oar oas oav ob- oba obb obk obo obr obs obv oka okb okk oko okr oks oo- ooa oob ook ooo oor oos oov or- ora orb ork oro orr ors orv os- osa osb osk oso osr oss osv ov- ova ovb ovo ovs ovv ra- raa rab rak rao rar ras rav rba rbb rbk rbo rbr rbs rkb rkk rko rks rkv roa rob rok roo ror ros rov rra rrb rrk rrr rrs rsa rsb rsk rso rsr rss rsv rva rvb rvo rvr rvs rvv saa sab sak sao sar sas sav sba sbb sbk sbo sbr sbs sbv sk- ska skb skk sko skr sks soa sob sok soo sor sos sov sr- sra srb srk sro srr srs srv ss- ssa ssb ssk sso ssr sss ssv sva svb svk svo svr svs svv v-a vaa vab vak vao var vas vav vba vbk vbo vbr vbs vbv vka vkb voa vob vok voo vor vos vov vra vrb vrk vrr vrs vsa vsb vsk vso vsr vss vsv vva vvb vvo vvr vvs vvv

a-ak a-ok aaaa aaab aaar aaas aaav aaba aabb aaka aaoo aara aaro aars aasa aass aava abaa abab abak abar abas abb- abba abbb abbo abbr abbs aboa abob abok aboo abor abos abov abra abro abrs abs- absa abss abva akaa akao akar akas akka akko akok akos akr- akra aksa aoba aoks aora aorb aors aoss arab arak arar aras arba arbs arka arko arks aroa arob aroo aror aros arr- arra arrk arro arrr arrs ars- arsa arsk arso arva arvo asaa asab asak asao asar asas asba asbo aska asko askr asks asob asok asor asos asra asro asrs assa assk asso assr asss asva asvs avab avao avar avas avor avos avra avro avva avvo baaa baak baar baas baba babb babo babr babs bak- baka bako bakr baks baos bar- bara barb bark baro barr bars basa bask baso bass bava bbas bbbb bbbs boab boak boar boas boba bobb bobo bobs boka boko boks boob book boor boos bor- bora bork boro borr bors bosa bosk boso boss bova bovo brab brak brao bras brav brka brkb broa brob brok broo bror bros brrr brrs brsb brsr bsaa bsas bsos bsra k-os kaaa kaab kaak kaar kaas kaba kabb kabo kabr kaka kakk kako kaks kaoa kaok kaor kaos kara karb kark karo karr kars karv kas- kasa kasb kask kaso kasr kass kava kavb kavo kavs kavv kbaa kbab kbak kbar kbas kbba kbbb kbbk kbbo kbbr kbbs kbkb kbkk kbko kbkr kbkv kboa kbob kbok kboo kbos kbov kbra kbrb kbrk kbro kbrv kbsa kbsb kbsk kbso kbsr kbss kbsv kbva kbvb kbvo kbvr kkaa kkar kkba kkbb kkbo kkbr kkbs kkkk kkoa kkob kkoo kkor kkov kkrb kkrk kkro kkrr kkrs kkrv kksa kksr kkss kkvr kkvv koab koak koar koas koba kobb kobk kobo kobr kobs koka kokb kokk koko kokr koks koob kook kooo koor koos koov kora korb kork koro korr kors korv kos- kosa kosb koso kosr koss kova kovk kovo kovr krab krak krar kras krav krba krbb krbk krbr krka krkk krko krkr krks krkv kroa krob krok kroo kror kros krov krrb krrk krro krrr krrs krsa krsk krsr krss krsv krva krvb krvk krvo krvr krvs krvv ksab ksak ksar ksas ksav ksba ksbr ksbs ksbv kska kskb kskk ksko kskr ksks ksob ksok ksoo ksor ksos ksra ksrb ksro ksrr ksrs ksrv kssa ksso kssr ksss ksva ksvr kvab kvak kvar kvas kvbr kvoa kvob kvok kvoo kvor kvov kvra kvro kvrr kvrv kvsa kvso kvsr kvss kvsv kvvr kvvs kvvv oaks oara oars oass oavs obak obas obba obbo obkb obok obor obos obra obro obsr obss obvs okak okas okka okko okok okor okra okro oksa okso ooaa ooak ooba oooo ooos oora oosa orab orak orao orar oras orav orba orbb orbo orbs orka orko oro- orok oror oros orra orro orrs orsa orsk orso orvr orvs osak osar osas osba osoo osor osos osov osro ossa ossb osso ovar ovo- ovoo ovra raab raak raas raba rabb rabk rabo rabs raka rakk raob raok raos rara rarb rark raro rars rasa rask raso rass rava rbbb rbbr rbbs rbss rkos rkss rksv roab roak roar roas rob- roba robb robo robs roka rokk roko rokr roks roob rook roor roos rora rork roro rosa roso ross rova rovo rovs rras rrrr rsaa rsos rssa s-os saab saak saar saas saba sabb sabo sabr sabs saka sakb sakk sako saks saor saos sara sark saro sarr sars sarv sasa sask saso sass sava savo savs sbaa sbar sbas sbbs sbor sbrk sbsa skab skar skor skov skra skss soak soar soas soba sobo sobr sobs soka sokk soko sook soor soos sora sorb soro sorr sors sosa soso soss sosv sova sovo sovs sras sros ssaa ssab ssao ssas ssbr ssra ssrs sssa sssb ssss svar svor vaar vaas vabs vaka vara vark varr vars vas- vasa vaso vass vava vavs vkor voar