a-ak a-ok aaaa aaab aaav aaba aabb aaka aaoo aava abaa abab abak abb- abba abbb abbo aboa abob abok aboo abov abva abza akaa akao akka akko akok aoba avab avao avaz avva avvo aza- azab azaz azo- azoo azov azza azzo baaa baak baaz baba babb babo bak- baka bako bava baza bazo bbbb boab boak boaz boba bobb bobo boka boko boob book booz bova bovo boza bozo bzzz kaaa kaab kaak kaba kabb kabo kabz kaka kakk kako kaoa kaok kava kavb kavo kavv kavz kaza kazo kazz kbaa kbab kbak kbaz kbba kbbb kbbk kbbo kbbz kbkb kbkk kbko kbkv kbkz kboa kbob kbok kboo kbov kboz kbva kbvb kbvo kbzo kbzz kkaa kkba kkbb kkbo kkbz kkkk kkoa kkob kkoo kkov kkoz kkvv kkzz koab koak koaz koba kobb kobk kobo koka kokb kokk koko kokz koob kook kooo koov kooz kova kovk kovo koza kozb kozk kozo kvab kvak kvaz kvbz kvoa kvob kvok kvoo kvov kvoz kvvv kvvz kzaz kzbb kzbk kzbv kzbz kzkz kzoo kzoz kzza kzzb kzzk kzzo kzzv kzzz obak obba obbo obkb obok okak okaz okka okko okok ooaa ooak ooba oooo ovo- ovoo vaka vava vaza vkzv voka vovk vvob vvvv zaav zaba zabo zaka zakk zaza zobo zoo- zook zovk zoza zozo zvab zzzz