a-ak a-ok aaaa aaab aaaf aaar aaba aabb aafa aafb aaff aaka aaoo aara aaro abaa abab abaf abak abar abb- abba abbb abbo abbr abff aboa abob abof abok aboo abor abra abro afaa afak afao afar affa affo afka afkr afoa afoo afor afr- afra afro akaa akao akar akka akko akok akr- akra aoba aora aorb arab araf arak arar arba arfa arfb arff arka arko aroa arob aroo aror arr- arra arrk arro arrr baaa baaf baak baar baba babb babo babr baff bafo bak- baka bako bakr bar- bara barb barf bark baro barr bbbb boab boak boar boba bobb bobo bofa boff boka boko boob boof book boor bor- bora borf bork boro borr brab braf brak brao brka brkb broa brob brok broo bror brrr f--k faaa faba fabo fafa faff fafo fako fara farb fark faro farr fbar ffar ffff ffrr fkab foaf foak foar foba fofo foof fook for- fora forb fork foro forr frab frak frob kaaa kaab kaaf kaak kaar kaba kabb kabf kabo kabr kafa kaff kafr kaka kakk kako kaoa kaok kaor kara karb karf kark karo karr kbaa kbab kbak kbar kbba kbbb kbbf kbbk kbbo kbbr kbfb kbff kbfk kbfo kbfr kbkb kbkf kbkk kbko kbkr kboa kbob kbok kboo kbra kbrb kbrf kbrk kbro kfab kfar kfbk kffa kffb kfff kffk kfka kfkb kfok kfoo kfor kfra kfro kfrr kkaa kkar kkba kkbb kkbo kkbr kkfr kkkk kkoa kkob kkoo kkor kkrb kkrf kkrk kkro kkrr koab koak koar koba kobb kobk kobo kobr kofa koff kofk kofo koka kokb kokf kokk koko kokr koob kook kooo koor kora korb korf kork koro korr krab krak krar krba krbb krbk krbr krff krfo krka krkk krko krkr kroa krob krof krok kroo kror krrb krrf krrk krro krrr oafo oara obak obba obbo obkb obok obor obra obro off- offa offo offr ofor ofra okak okka okko okok okor okra okro ooaa ooak ooba ooff oooo oora orab orak orao orar orba orbb orbo orff orka orko oro- orof orok oror orra orro raab raaf raak raba rabb rabk rabo rafa raff raka rakk raob raok rara rarb rarf rark raro rbaf rbbb rbbr rkkf roab roaf roak roar rob- roba robb robo roff rofo roka rokk roko rokr roob roof rook roor rora rork roro rrrr