a-ii aaaa aaab aaai aaba aabb aabi aaib aaii aaoo abaa abab abai abax abb- abba abbb abbi abbo abia abib aboa abob aboo abox aiai aiba aibo aiia aiib aioi aixa aixi aoba axi- axia axo- axoa axxo ba-i ba-x baaa baba babb babi babo baia baib baio baix baxi bbbb bbox biao biba bibb bibi bibo bio- bioi biox bixa bixi boab boai boba bobb bobi bobo boi- boii boob boox boxa iaaa iaai iaba iaia ibia ibox iiii iiio iioi iioo ioba iobi ioii ioio iooi iooo ixia ixxi obai obba obbo obia obix oboi obox oiba oiii ooaa ooba oobi ooia oooo oxa- oxi- oxia oxo- oxox oxxo xbai xbox xiao xibo xiii xixi xoxo xxii xxix xxxi xxxo xxxx