a-ii a-iv aaaa aaab aaai aaap aaar aaav aaba aabb aabi aabp aaib aaii aapa aapi aara aari aarp aava abaa abab abai abap abar abb- abba abbb abbi abbr abia abib abir abpa abpi abpp abpr abra abri abva abvp aiai aiba aiia aiib aiir aipa aipi aira airi airp aiva 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 arva arvi avab avar avia avip aviv avra avri avva ba-i baaa baar baba babb babi babr baia baib bair bapa bapi bapp bar- bara barb bari barr bava bavi bbbb bbpr biap biar biba bibb bibi bipa bipp bira birb biri birr bivi bpai brab brai brav bria brrr brvi iaaa iaai iaap iaba iaia iapa iapp iara iava ibar ibia ibra ibri iiii iipa iira ipba ippa ippr ipri irai irap irar irbp iri- iria irip irpa irra irri ivai ivar ivbv paap paar paba paia paib paip pair papa papb papi papp papr par- para pari parp parr parv pava pbar pbpa piai pibb pibi piia piip pipa pipi pipp pira piri pirr piva ppap ppar ppbv ppib pppa pppp prai prar pri- pria prii priv prri pvpa raab raba rabb rabi raia raii raip rair rapa rapi rapp rara rarb rari rava ravi rbbb rbbr riaa riab riai rib- riba riia ripa ripi ripp ripr riri riva rivp rpii rrrr vaar vaia vair vapa vapb vapi vara vari varp varr vava viar viii vipr vira virb viri virr viva vivi vrai vrap vrav vrba vria vvpb vvvv