a-ak a-ok aaaa aaab aaar aaba aabb aabt aaka aaoo aara aaro aart aata aatk aatt abaa abab abak abar abat abb- abba abbb abbo abbr abbt aboa abob abok aboo abor abot abra abro abta akaa akao akar akka akko akok akot akr- akra aoba aora aorb aort arab arak arar arat arba arka arko aroa arob aroo aror arr- arra arrk arro arrr arrt arta arto artr at-t ataa atab atak atar atat atka atkt atob atok ator atot atra atrk atro atta atto attr baaa baak baar baat baba babb babo babr bak- baka bako bakr bakt bar- bara barb bark baro barr bart bata bato batt bbbb boab boak boar boat boba bobb bobo boka boko boob book boor boot bor- bora bork boro borr bort bota botb boto bott brab brak brao brat brka brkb broa brob brok broo bror brot brrr btaa btob btor btrt bttb kaaa kaab kaak kaar kaat kaba kabb kabo kabr kaka kakk kako kakt kaoa kaok kaor kara karb kark karo karr kart kat- kata katb katk kato katr katt kbaa kbab kbak kbar kbat kbba kbbb kbbk kbbo kbbr kbbt kbkb kbkk kbko kbkr kboa kbob kbok kboo kbot kbra kbrb kbrk kbro kbrt kbta kbtb kbtk kbto kbtr kbtt kkaa kkar kkat kkba kkbb kkbo kkbr kkbt kkkk kkoa kkob kkoo kkor kkot kkrb kkrk kkro kkrr kkrt kktk koab koak koar koba kobb kobk kobo kobr koka kokb kokk koko kokr koob kook kooo koor koot kora korb kork koro korr kort kota kotb kotk koto kotr kott krab krak krar krat krba krbb krbk krbr krbt krka krkk krko krkr kroa krob krok kroo kror krrb krrk krro krrr krrt krta krtk krto krtr ktaa ktak ktao ktar ktat ktba ktbb ktbr ktbt ktkb ktkk ktko ktkr ktkt ktob ktok ktoo ktor ktot ktrb ktrk ktro ktrr ktrt kttk ktto kttr kttt oara obak obba obbo obkb obok obor obot obra obro okak okka okko okok okor okot okra okro okta okto ooaa ooak ooba oooo oora oort ootb orab orak orao orar orat orba orbb orbo orka orko oro- orok oror orot orra orro orta orto otak otar oto- otok otoo otor otra otro otta otto raab raak raat raba rabb rabk rabo raka rakk rakt raob raok rara rarb rark raro rata ratk rato ratt rbbb rbbr roab roak roar roat rob- roba robb robo robt roka rokk roko rokr roob rook roor root rora rork roro rort rota rotk roto rotr rott rrat rrrr taa- taar taat taba tabb tabo taka takk tako takt taoa taor tara tarb tark taro tarr tart tata tatb tato tatr tatt tbar tbrb tbta toab toat toba tobo tobt toka toko tooa took toor toot tora tork toro torr tort tota toto totr tott traa trab trak trao trat troa troo trot trra trtr ttab ttbb tttt