a-ak a-ok aaaa aaab aaar aaas aaba aabb aaka aaoo aara aaro aars aasa aass abaa abab abak abar abas abb- abba abbb abbo abbr abbs aboa abob abok aboo abor abos abra abro abrs abs- absa abss 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 asaa asab asak asao asar asas asba asbo aska asko askr asks asob asok asor asos asra asro asrs assa assk asso assr asss 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 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 brab brak brao bras 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 kas- kasa kasb kask kaso kasr kass kbaa kbab kbak kbar kbas kbba kbbb kbbk kbbo kbbr kbbs kbkb kbkk kbko kbkr kboa kbob kbok kboo kbos kbra kbrb kbrk kbro kbsa kbsb kbsk kbso kbsr kbss kkaa kkar kkba kkbb kkbo kkbr kkbs kkkk kkoa kkob kkoo kkor kkrb kkrk kkro kkrr kkrs kksa kksr kkss koab koak koar koas koba kobb kobk kobo kobr kobs koka kokb kokk koko kokr koks koob kook kooo koor koos kora korb kork koro korr kors kos- kosa kosb koso kosr koss krab krak krar kras krba krbb krbk krbr krka krkk krko krkr krks kroa krob krok kroo kror kros krrb krrk krro krrr krrs krsa krsk krsr krss ksab ksak ksar ksas ksba ksbr ksbs kska kskb kskk ksko kskr ksks ksob ksok ksoo ksor ksos ksra ksrb ksro ksrr ksrs kssa ksso kssr ksss oaks oara oars oass obak obas obba obbo obkb obok obor obos obra obro obsr obss okak okas okka okko okok okor okra okro oksa okso ooaa ooak ooba oooo ooos oora oosa orab orak orao orar oras orba orbb orbo orbs orka orko oro- orok oror oros orra orro orrs orsa orsk orso osak osar osas osba osoo osor osos osro ossa ossb osso raab raak raas raba rabb rabk rabo rabs raka rakk raob raok raos rara rarb rark raro rars rasa rask raso rass rbbb rbbr rbbs rbss rkos rkss roab roak roar roas rob- roba robb robo robs roka rokk roko rokr roks roob rook roor roos rora rork roro rosa roso ross 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 sasa sask saso sass sbaa sbar sbas sbbs sbor sbrk sbsa skab skar skor skra skss soak soar soas soba sobo sobr sobs soka sokk soko sook soor soos sora sorb soro sorr sors sosa soso soss sras sros ssaa ssab ssao ssas ssbr ssra ssrs sssa sssb ssss