a-ak a-do a-ok aaaa aaab aaad aaar aaba aabb aabd aada aaka aaoo aara aard aaro abaa abab abad abak abar abb- abba abbb abbo abbr abda abdo aboa abob abod abok aboo abor abra abro adaa adab adad adak adao adar adba adda addd addo addr adob adod adok adoo ador adra adro akaa akao akar akka akko akok akr- akra aoba aora aorb arab arad arak arar arba arda ardo arka arko aroa arob arod aroo aror arr- arra arrk arro arrr baaa baad baak baar baba babb babo babr bada badb badd bado badr bak- baka bako bakr bar- bara barb bard bark baro barr bbad bbbb bbdd bbdo bd-r boab boad boak boar boba bobb bobo boda bodb bodo boka boko boob bood book boor bor- bora bord bork boro borr brab brad brak brao brda brdo brka brkb broa brob brod brok broo bror brrr d-bo daab daad daar daba dabb dabo dada dado daka dako dara darb dard dark daro darr dbar dddd dkba doab doak doar doba dobb dod- doda dodd dodo doka doko doob dood dook door dora dord dork doro dorr draa drab drad drak drar drba drda drob drod drra kaaa kaab kaak kaar kaba kabb kabd kabo kabr kad- kada kadd kado kadr kaka kakk kako kaoa kaok kaor kara karb kard kark karo karr kbaa kbab kbad kbak kbar kbba kbbb kbbd kbbk kbbo kbbr kbdb kbdo kbdr kbkb kbkk kbko kbkr kboa kbob kbod kbok kboo kbra kbrb kbrd kbrk kbro kdaa kdab kdad kdak kdao kdar kdbb kdbr kddb kddd kddk kddr kdka kdkb kdkd kdkk kdko kdkr kdok kdrb kdro kkaa kkar kkba kkbb kkbd kkbo kkbr kkda kkdd kkdo kkkk kkoa kkob kkoo kkor kkrb kkrk kkro kkrr koab koak koar koba kobb kobk kobo kobr koda kodk kodo koka kokb kokk koko kokr koob kook kooo koor kora korb kord kork koro korr krab krad krak krar krba krbb krbd krbk krbr krda krdd krdo krdr krka krkd krkk krko krkr kroa krob krod krok kroo kror krrb krrk krro krrr oara obad obak obba obbo obkb obok obor obra obro odbo odda oddd odoo odor odra okak okka okko okok okor okra okro ooaa ooak ooba ooda oooo oora oord orab orad orak orao orar orba orbb orbo orda ordo orka orko oro- orok oror orra orro raab raad raak raba rabb rabk rabo rada radd rado radr raka rakk raob raok rara rarb rark raro rbbb rbbr roab road roak roar rob- roba robb robo roda rodd rodo roka rokk roko rokr roob rood rook roor rora rork roro rrad rrrr