a-be a-ii aaaa aaab aaae aaai aaar aaba aabb aabi aaea aaib aaii aaoe aaoo aara aare aari aaro abaa abab abae abai abar abb- abba abbb abbe abbi abbo abbr abee aber abia abib abie abir aboa abob aboo abor abra abri abro aebi aeer aeio aer- aera aeri aero aiai aiba aibo aiea aiee aiia aiib aiir aioi aira aire airi airo aoba aora aorb arab arae arai arar arba arbe arbi area aree arei areo aria arib arie arii ario aroa arob aroe aroi aroo aror arr- arra arre arri arro arrr ba-i baaa baar baba babb babe babi babo babr baer baia baib baie baio bair bar- bara barb bare bari baro barr bbbb bbeb bear beba bebb bebe bebi bebo beeb beer beia beir beo- beor bera bere beri bero berr biao biar biba bibb bibe bibi bibo bieb bier bio- bioi bira birb bire biri biro birr boab boai boar boba bobb bobe bobi bobo boea boee boeo boer boi- boie boii boob booe boor bor- bora bore bori boro borr brab brae brai brao brea breb bree brei breo brer bria brie brio broa brob broe broo bror brrr eaba eara earb eare earo ebba ebbo ebbr eber eboe eboo ebor ebro eeea eeee eera eero eiao eiei eier eira eire eoir eora eore eori erba erbb erbe ereb erei erer eria erie erio erob eroe eroi eroo erra erre erro i-be iaaa iaai iaba iaea iaia iara iare ibar ibea ibia ibie ibra ibri ibro ieie ieio iera iere ieri iiie iiii iiio iioi iioo iira ioba iobi ioee ioii ioio iooi iooo iora iore iori irae irai irao irar irbe iree irer iri- iria irie irio irob irra irre irri o-eo oaer oara oare obai obba obbo obea ober obia obie oboe oboi obor obra obre obri obro oera oere oiba oier oiii oira oire ooaa ooba oobe oobi ooer ooia oooo oora oore orab orae orai orao orar orba orbb orbe orbi orbo ore- orea oreb oreo orer ori- oria orie orio oro- oroe oror orra orri orro raab raba rabb rabe rabi rabo raer raia raie raii rair raob rara rarb rare rari raro rbbb rbbr rea- reae reao rear reba rebb rebe rebo reeb reia reii reir rera rere reri rero riaa riab riai rib- riba ribe ribo rier riia rire riri roab roar rob- roba robb robe robi robo roea roer roia roio roir roob rooi roor rora rore rori roro rrrr