a-ii a-iv aaaa aaab aaai aaar aaav aaba aabb aabi aaib aaii aara aari aava abaa abab abai abar abb- abba abbb abbi abbr abia abib abir abra abri abva aiai aiba aiia aiib aiir aira airi aiva arab arai arar arba arbi aria arib arii arr- arra arri arrr arva arvi avab avar avia aviv avra avri avva ba-i baaa baar baba babb babi babr baia baib bair bar- bara barb bari barr bava bavi bbbb biar biba bibb bibi bira birb biri birr bivi brab brai brav bria brrr brvi iaaa iaai iaba iaia iara iava ibar ibia ibra ibri iiii iira irai irar iri- iria irra irri ivai ivar ivbv raab raba rabb rabi raia raii rair rara rarb rari rava ravi rbbb rbbr riaa riab riai rib- riba riia riri riva rrrr vaar vaia vair vara vari varr vava viar viii vira virb viri virr viva vivi vrai vrav vrba vria vvvv