a-ak a-be a-ok aaaa aaab aaae aaaf aaba aabb aaea aafa aafb aaff aaka aake aaoe aaoo abaa abab abae abaf abak abb- abba abbb abbe abbo abee abff aboa abob abof abok aboo aeaf aeka afaa afak afao afee afek affa affo afka afoa afoe afoo akaa akae akao akee akka akko akok aoba baaa baaf baak baba babb babe babo baek baff bafo bak- baka bake bako bbbb bbeb beaf beak beba bebb bebe bebo beeb beef beek befa befe beff befo beka beke beko beo- beof beok boab boak boba bobb bobe bobo boea boee boef boeo bofa bofe boff boka boke boko boob booe boof book eaaf eaba eafb ebba ebbo eboe eboo eeea eeee eefa eefe eeka eeke efab efeo effa efke eka- ekab ekeb ekek ekka ekoa eoka f--k faaa faba fabe fabo faeb fafa fafe faff fafo fake fako feaf feak feba febo feeb feek fefe feff fefo feke feko feof ffee ffff fkab foaf foak foba fofo foke foof fook kaaa kaab kaaf kaak kaba kabb kabe kabf kabo kaeo kafa kafe kaff kaka kake kakk kako kaoa kaok kbaa kbab kbae kbak kbba kbbb kbbe kbbf kbbk kbbo kbeb kbee kbef kbek kbeo kbfb kbff kbfk kbfo kbkb kbkf kbkk kbko kboa kbob kboe kbok kboo kea- keak keba kebb kebe keef keek kefa kefb keff keka kekb keke keko keok kfab kfbk kfeb kffa kffb kfff kffk kfka kfkb kfok kfoo kkaa kkba kkbb kkbe kkbo kkea kkkk kkoa kkob kkoo koab koae koak koba kobb kobe kobk kobo koea kofa kofe koff kofk kofo koka kokb koke kokf kokk koko koob kook kooo o-eo oafo oake obak obba obbo obea obkb oboe obok ofek off- offa offe offo okak okka okko okok ooaa ooak ooba oobe ooff oooo