a-ii aaaa aaab aaai aaap aaba aabb aabi aabp aaib aaii aaoo aapa aapi aapo abaa abab abai abap abax abb- abba abbb abbi abbo abia abib aboa abob aboo abox abpa abpi abpp aiai aiba aibo aiia aiib aioi aipa aipi aixa aixi aoba aopo apai apao apap apax apba api- apia apio apip apix apo- apoo apop apox appa appx axi- axia axo- axoa axxo ba-i ba-x baaa baba babb babi babo baia baib baio baix bapa bapi bapp baxi bbbb bbox biao biap biba bibb bibi bibo bio- bioi biox bipa bipp bixa bixi boab boai boba bobb bobi bobo boi- boii boob boop boox bopa bopp boxa bpai iaaa iaai iaap iaba iaia iapa iapp iapx ibia ibox iiii iiio iioi iioo iiop iipa ioba iobi ioii ioio iooi iooo ipba ipix ipop ippa ippo ixia ixxi oapi obai obba obbo obia obix oboi obox oiba oiii ooaa ooba oobi ooia oooo opap opia opii opio opo- oppa oppi oppo oxa- oxi- oxia oxo- oxox oxxo paap paba pabx paia paib paio paip paix paox papa papb papi papp paxi paxo pbpa piai piao pibb pibi piia piip piob pipa pipi pipo pipp pixo pixx poba pobo poia poio poix poop pop- popa popi popo popp ppap ppib ppoa pppa pppo pppp xapi xapo xbai xbox xiao xiap xibo xiii xixi xoxo xpax xxii xxix xxxi xxxo xxxx