a-ak a-be a-ok aaaa aaab aaae aaav aaba aabb aaea aaev aaka aake aaoe aaoo aava abaa abab abae abak abb- abba abbb abbe abbo abee aboa abob abok aboo abov abva aeka aeva akaa akae akao akee akka akko akok aoba avab avao avea aveo avva avvo baaa baak baba babb babe babo baek bak- baka bake bako bava bave bbbb bbeb beak beav beba bebb bebe bebo beeb beek beka beke beko beo- beok bevo boab boak boba bobb bobe bobo boea boee boeo boka boke boko boob booe book bova bove bovo eaba eave ebba ebbo eboe eboo eeea eeee eeka eeke eeva eka- ekab ekeb ekek ekka ekoa eoka evae evea evoe evoo evvk kaaa kaab kaak kaba kabb kabe kabo kaeo kaka kake kakk kako kaoa kaok kava kavb kave kavo kavv kbaa kbab kbae kbak kbba kbbb kbbe kbbk kbbo kbeb kbee kbek kbeo kbev kbkb kbkk kbko kbkv kboa kbob kboe kbok kboo kbov kbva kbvb kbvo kea- keak keba kebb kebe keek keka kekb keke keko keok keva keve kkaa kkba kkbb kkbe kkbo kkea kkkk kkoa kkob kkoo kkov kkvv koab koae koak koba kobb kobe kobk kobo koea koka kokb koke kokk koko koob kook kooo koov kova kove kovk kovo kvab kvak kvea kvoa kvob kvoe kvok kvoo kvov kvvv o-eo oake obak obba obbo obea obkb oboe obok okak okka okko okok ooaa ooak ooba oobe oooo ovee ovo- ovoo vaka vake vava veak veba veka veke veve vevo voka voke vovk vvob vvvv