a-ii a-iv aaaa aaab aaai aaar aaav aaba aabb aabi aaib aaii aaoo aara aari aaro aava abaa abab abai abar abb- abba abbb abbi abbo abbr abia abib abir aboa abob aboo abor abov abra abri abro abva aiai aiba aibo aiia aiib aiir aioi aira airi airo aiva aoba aora aorb arab arai arar arba arbi aria arib arii ario aroa arob aroi aroo aror arr- arra arri arro arrr arva arvi arvo avab avao avar avia avio aviv avor avra avri avro avva avvo ba-i baaa baar baba babb babi babo babr baia baib baio bair bar- bara barb bari baro barr bava bavi bbbb biao biar biba bibb bibi bibo bio- bioi bira birb biri biro birr bivi boab boai boar boba bobb bobi bobo boi- boii boob boor bor- bora bori boro borr bova bovi bovo brab brai brao brav bria brio broa brob broo bror brrr brvi iaaa iaai iaba iaia iara iava ibar ibia ibra ibri ibro iiii iiio iioi iioo iira ioba iobi ioii ioio iooi iooo iora iori irai irao irar iri- iria irio irob irov irra irri ivai ivao ivar ivbv ivor oara obai obba obbo obia oboi obor obra obri obro obvi oiav oiba oiii oira ooaa ooba oobi ooia oooo oora orab orai orao orar orav orba orbb orbi orbo ori- oria orio oro- oror orra orri orro orvr ovar ovi- ovo- ovoo ovra raab raba rabb rabi rabo raia raii rair raob rara rarb rari raro rava ravi rbbb rbbr riaa riab riai rib- riba ribo riia riri riva rivo roab roar rob- roba robb robi robo roia roio roir roob rooi roor rora rori roro rova rovi rovo rrrr vaar vaia vaio vair vara vari varr vava viar viii vira virb viri viro virr viva vivi vivo voar voia voio voir voor vor- vora vori voro vrai vrav vrba vria vrio vvob vvvv