a-ak a-ok aaaa aaab aaba aabb aaka aaoo abaa abab abak abb- abba abbb abbo aboa abob abok aboo abza akaa akao akka akko akok aoba aza- azab azaz azo- azoo azza azzo baaa baak baaz baba babb babo bak- baka bako baza bazo bbbb boab boak boaz boba bobb bobo boka boko boob book booz boza bozo bzzz kaaa kaab kaak kaba kabb kabo kabz kaka kakk kako kaoa kaok kaza kazo kazz kbaa kbab kbak kbaz kbba kbbb kbbk kbbo kbbz kbkb kbkk kbko kbkz kboa kbob kbok kboo kboz kbzo kbzz kkaa kkba kkbb kkbo kkbz kkkk kkoa kkob kkoo kkoz kkzz koab koak koaz koba kobb kobk kobo koka kokb kokk koko kokz koob kook kooo kooz koza kozb kozk kozo kzaz kzbb kzbk kzbz kzkz kzoo kzoz kzza kzzb kzzk kzzo kzzz obak obba obbo obkb obok okak okaz okka okko okok ooaa ooak ooba oooo zaba zabo zaka zakk zaza zobo zoo- zook zoza zozo zzzz