a-be a-wa aaaa aaab aaae aaba aabb aabw aaea aaoe aaoo aaow aaww abaa abab abae abaw abb- abba abbb abbe abbo abee aboa abob aboo abow abwa abwe aoba awae awbe awe- aweb awee awoo awow awwa baaa baba babb babe babo baw- bawe bbbb bbeb beaw beba bebb bebe bebo beeb beo- bewa bewe boab boba bobb bobe bobo bobw boea boee boeo boob booe boow bowa bowe bwaa eaba ebba ebbo ebbw eboe eboo ebow eeea eeee ewew o-eo obba obbo obea oboe ooaa ooba oobe oooo owea owoe owow owwa waaa waao waaw waba wabb wabe wabo wabw waeb waee waew waob waoe waoo waow wawa wawb wawe wawo wbaa wbab wbae wbbb wbbe wbbo wbbw wbea wbeb wbew wbob wbow wbwb wbwo weaa weao webb webe webo weeb weeo weoa weow wewe wewo woaa woab woba wobb wobe wobo woob woow wowb wowe wowo woww wwab wwba wwbb wwea wweb wweo wwow wwwa wwwe wwww