a-be a-ii aaaa aaab aaae aaai aaar aaba aabb aabi aaea aaib aaii aara aare aari abaa abab abae abai abar abax abb- abba abbb abbe abbi abbr abee aber abia abib abie abir abra abri aebi aeer aer- aera aeri aiai aiba aiea aiee aiia aiib aiir aira aire airi airx aixa aixi arab arae arai arar arax arba arbe arbi area aree arei arex aria arib arie arii arr- arra arre arri arrr axar axer axi- axia axie ba-i ba-x baaa baar baba babb babe babi babr baer baia baib baie bair baix bar- bara barb bare bari barr barx baxi bbbb bbeb bear beba bebb bebe bebi beeb beer beia beir bera bere beri berr biar biba bibb bibe bibi bieb bier bira birb bire biri birr birx bixa bixi brab brae brai brax brea breb bree brei brer brex bria brie brix brrr eaba eara earb eare ebba ebbr eber ebix eeea eeee eera eiei eier eira eire er-x erba erbb erbe ereb erei erer eria erie erra erre exa- exai exer exrx i-be iaaa iaai iaba iaea iaia iara iare ibar ibea ibex ibia ibie ibra ibri ieie iera iere ieri iiie iiii iira irae irai irar irbe iree irer irex iri- iria irie irix irra irre irri ixia ixxi raab raba rabb rabe rabi raer raia raie raii rair raix rara rarb rare rari raxa raxi rbbb rbbr rea- reae rear reba rebb rebe reeb reia reii reir rera rere reri rexx riaa riab riai rib- riba ribe rier riex riia rire riri rixe rrrr xaar xara xare xbai xbar xbee xbra xeer xer- xera xexe xibe xiii xixi xxii xxix xxxi xxxx