a-ii aaaa aaab aaai aaap aaar aaba aabb aabi aabp aaib aaii aapa aapi aara aari aarp abaa abab abai abap abar abb- abba abbb abbi abbr abia abib abir abpa abpi abpp abpr abra abri aiai aiba aiia aiib aiir aipa aipi aira airi airp apai apap apar apba apbr api- apia apip appa appr apra apri arab arai arap arar arba arbi aria arib arii arip arpa arpi arr- arra arri arrr ba-i baaa baar baba babb babi babr baia baib bair bapa bapi bapp bar- bara barb bari barr bbbb bbpr biap biar biba bibb bibi bipa bipp bira birb biri birr bpai brab brai bria brrr iaaa iaai iaap iaba iaia iapa iapp iara ibar ibia ibra ibri iiii iipa iira ipba ippa ippr ipri irai irap irar irbp iri- iria irip irpa irra irri paap paar paba paia paib paip pair papa papb papi papp papr par- para pari parp parr pbar pbpa piai pibb pibi piia piip pipa pipi pipp pira piri pirr ppap ppar ppib pppa pppp prai prar pri- pria prii prri raab raba rabb rabi raia raii raip rair rapa rapi rapp rara rarb rari rbbb rbbr riaa riab riai rib- riba riia ripa ripi ripp ripr riri rpii rrrr