a-ii aaaa aaab aaai aaap aaar aaba aabb aabi aabp aaib aaii aaoo aapa aapi aapo aara aari aaro aarp abaa abab abai abap abar abb- abba abbb abbi abbo abbr abia abib abir aboa abob aboo abor abpa abpi abpp abpr abra abri abro aiai aiba aibo aiia aiib aiir aioi aipa aipi aira airi airo airp aoba aopo aora aorb apai apao apap apar apba apbr api- apia apio apip apo- apoo apop apor appa appr apra apri apro arab arai arap arar arba arbi aria arib arii ario arip aroa arob aroi aroo aror arpa arpi arr- arra arri arro arrr ba-i baaa baar baba babb babi babo babr baia baib baio bair bapa bapi bapp bar- bara barb bari baro barr bbbb bbpr biao biap biar biba bibb bibi bibo bio- bioi bipa bipp bira birb biri biro birr boab boai boar boba bobb bobi bobo boi- boii boob boop boor bopa bopp bor- bora bori boro borr bpai brab brai brao bria brio broa brob broo bror brrr iaaa iaai iaap iaba iaia iapa iapp iara ibar ibia ibra ibri ibro iiii iiio iioi iioo iiop iipa iira ioba iobi ioii ioio iooi iooo iora iori ipba ipop ippa ippo ippr ipri irai irao irap irar irbp iri- iria irio irip irob irop irpa irra irri oapi oara obai obba obbo obia oboi obor obra obri obro oiba oiii oira ooaa ooba oobi ooia oooo oora opap opar opia opii opio opo- opor oppa oppi oppo opra orab orai orao orar orba orbb orbi orbo ori- oria orio oro- oror orpi orra orri orro paap paar paba paia paib paio paip pair papa papb papi papp papr par- para pari paro parp parr pbar pbpa piai piao pibb pibi piia piip piob pipa pipi pipo pipp pira piri piro pirr poar poba pobo poia poio poop poor pop- popa popi popo popp pora porb pori poro porr ppap ppar ppib ppoa pppa pppo pppp prai prao prar pri- pria prii pro- proa prob proo prop prri raab raba rabb rabi rabo raia raii raip rair raob raop rapa rapi rapp rara rarb rari raro rbbb rbbr riaa riab riai rib- riba ribo riia ripa ripi ripp ripr riri roab roap roar rob- roba robb robi robo roia roio roir roob rooi roop roor ropa ropo rora rori roro rpii rpob rrrr