a-ak a-do a-ok aaaa aaab aaad aaar aaav aaba aabb aabd aada aaka aaoo aara aard aaro aava abaa abab abad abak abar abb- abba abbb abbo abbr abda abdo aboa abob abod abok aboo abor abov abra abro abva abvd adaa adab adad adak adao adar adba adda addd addo addr adob adod adok adoo ador adra adro advb 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 arva arvo avab avao avar avda avor avra avro avva avvo baaa baad baak baar baba babb babo babr bada badb badd bado badr bak- baka bako bakr bar- bara barb bard bark baro barr bava bbad bbbb bbdd bbdo bd-r bdav boab boad boak boar boba bobb bobo boda bodb bodo boka boko boob bood book boor bor- bora bord bork boro borr bova bovo brab brad brak brao brav 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 dava 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 dvar dvda dvdr dvoa dvor dvra kaaa kaab kaak kaar kaba kabb kabd kabo kabr kad- kada kadd kado kadr kadv kaka kakk kako kaoa kaok kaor kara karb kard kark karo karr karv kava kavb kavo kavv kbaa kbab kbad kbak kbar kbba kbbb kbbd kbbk kbbo kbbr kbdb kbdo kbdr kbdv kbkb kbkk kbko kbkr kbkv kboa kbob kbod kbok kboo kbov kbra kbrb kbrd kbrk kbro kbrv kbva kbvb kbvo kbvr kdaa kdab kdad kdak kdao kdar kdav kdbb kdbr kdbv kddb kddd kddk kddr kdka kdkb kdkd kdkk kdko kdkr kdok kdov kdrb kdro kdrv kdva kdvb kdvr kdvv kkaa kkar kkba kkbb kkbd kkbo kkbr kkda kkdd kkdo kkdv kkkk kkoa kkob kkoo kkor kkov kkrb kkrk kkro kkrr kkrv kkvr kkvv koab koak koar koba kobb kobk kobo kobr koda kodk kodo kodv koka kokb kokk koko kokr koob kook kooo koor koov kora korb kord kork koro korr korv kova kovk kovo kovr krab krad krak krar krav krba krbb krbd krbk krbr krda krdd krdo krdr krka krkd krkk krko krkr krkv kroa krob krod krok kroo kror krov krrb krrk krro krrr krva krvb krvk krvo krvr krvv kvab kvak kvar kvbr kvda kvoa kvob kvod kvok kvoo kvor kvov kvra kvro kvrr kvrv kvvr kvvv oara obad obak obba obbo obkb obok obor obra obro odbo odda oddd odoo odor odra odva okak okka okko okok okor okra okro ooaa ooak ooba ooda oooo oora oord orab orad orak orao orar orav orba orbb orbo orda ordo orka orko oro- orok oror orra orro orvr ovar ovda ovo- ovod ovoo ovra raab raad raak raba rabb rabk rabo rada radd rado radr raka rakk raob raok rara rarb rark raro rava rbbb rbbr roab road roak roar rob- roba robb robo roda rodd rodo roka rokk roko rokr roob rood rook roor rora rork roro rova rovo rrad rrrr vaad vaar vada vado vaka vara vard vark varr vava vkor voad voar voda vodo voka voor vor- vora vord voro vovk vrak vrav vrba vvob vvvv