a-ii aaaa aaab aaai aaar aaba aabb aabi aaib aaii aaoo aara aari aaro abaa abab abai abar abax abb- abba abbb abbi abbo abbr abia abib abir aboa abob aboo abor abox abra abri abro aiai aiba aibo aiia aiib aiir aioi aira airi airo airx aixa aixi aoba aora aorb arab arai arar arax arba arbi aria arib arii ario aroa arob aroi aroo aror arr- arra arri arro arrr axar axi- axia axo- axoa axxo ba-i ba-x baaa baar baba babb babi babo babr baia baib baio bair baix bar- bara barb bari baro barr barx baxi bbbb bbox biao biar biba bibb bibi bibo bio- bioi biox bira birb biri biro birr birx bixa bixi boab boai boar boba bobb bobi bobo boi- boii boob boor boox bor- bora bori boro borr boxa brab brai brao brax bria brio brix broa brob broo bror brox brrr iaaa iaai iaba iaia iara ibar ibia ibox ibra ibri ibro iiii iiio iioi iioo iira ioba iobi ioii ioio iooi iooo iora iori irai irao irar iri- iria irio irix irob irra irri ixia ixxi oara obai obba obbo obia obix oboi obor obox obra obri obro oiba oiii oira ooaa ooba oobi ooia oooo oora orab orai orao orar orba orbb orbi orbo ori- oria orio orix oro- oror orra orri orro oxa- oxi- oxia oxo- oxox oxxo raab raba rabb rabi rabo raia raii rair raix raob rara rarb rari raro raxa raxi rbbb rbbr riaa riab riai rib- riba ribo riia riri rixo roab roar rob- roba robb robi robo roia roio roir roob rooi roor roox rora rori roro roxa roxo rrrr xaar xara xbai xbar xbox xbra xiao xibo xiii xixi xoro xoxo xxii xxix xxxi xxxo xxxx