a-ii aaaa aaab aaai aaap aaba aabb aabi aabp aaib aaii aaoo aapa aapi aapo abaa abab abai abap abb- abba abbb abbi abbo abia abib aboa abob aboo abpa abpi abpp aiai aiba aibo aiia aiib aioi aipa aipi aoba aopo apai apao apap apba api- apia apio apip apo- apoo apop appa ba-i baaa baba babb babi babo baia baib baio bapa bapi bapp bbbb biao biap biba bibb bibi bibo bio- bioi bipa bipp boab boai boba bobb bobi bobo boi- boii boob boop bopa bopp bpai iaaa iaai iaap iaba iaia iapa iapp ibia iiii iiio iioi iioo iiop iipa ioba iobi ioii ioio iooi iooo ipba ipop ippa ippo oapi obai obba obbo obia oboi oiba oiii ooaa ooba oobi ooia oooo opap opia opii opio opo- oppa oppi oppo paap paba paia paib paio paip papa papb papi papp pbpa piai piao pibb pibi piia piip piob pipa pipi pipo pipp poba pobo poia poio poop pop- popa popi popo popp ppap ppib ppoa pppa pppo pppp