a-ii aaaa aaab aaai aaar aaba aabb aabi aaib aaii aaoo aara aari aaro abaa abab abai abar abb- abba abbb abbi abbo abbr abia abib abir aboa abob aboo abor abra abri abro aiai aiba aibo aiia aiib aiir aioi aira airi airo aoba aora aorb arab arai arar arba arbi aria arib arii ario aroa arob aroi aroo aror arr- arra arri arro arrr ba-i baaa baar baba babb babi babo babr baia baib baio bair bar- bara barb bari baro barr bbbb biao biar biba bibb bibi bibo bio- bioi bira birb biri biro birr boab boai boar boba bobb bobi bobo boi- boii boob boor bor- bora bori boro borr brab brai brao bria brio broa brob broo bror brrr iaaa iaai iaba iaia iara 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 irra irri oara obai obba obbo obia oboi obor obra obri obro oiba oiii oira ooaa ooba oobi ooia oooo oora orab orai orao orar orba orbb orbi orbo ori- oria orio oro- oror orra orri orro raab raba rabb rabi rabo raia raii rair raob rara rarb rari raro rbbb rbbr riaa riab riai rib- riba ribo riia riri roab roar rob- roba robb robi robo roia roio roir roob rooi roor rora rori roro rrrr