a-ii a-iv aaaa aaab aaai aaar aaav aaba aabb aabi aabt aaib aaii aara aari aart aata aatt aava abaa abab abai abar abat abb- abba abbb abbi abbr abbt abia abib abir abit abra abri abta abva aiai aiba aiia aiib aiir aira airi airt aita aiti aitr aitt aiva arab arai arar arat arba arbi aria arib arii arit arr- arra arri arrr arrt arta arti artr artv arva arvi at-t ataa atab atai atar atat atia atit atra atri atta atti attr atvi avab avar avat avia avit aviv avra avri avva ba-i baaa baar baat baba babb babi babr baia baib bair bait bar- bara barb bari barr bart bata bati batt bava bavi bbbb biar biat biba bibb bibi bira birb biri birr birt bita bitt bivi brab brai brat brav bria brit brrr brvi btaa btrt bttb btvi iaaa iaai iaat iaba iaia iara iart iata iati iava ibar ibat ibia ibra ibri ibtb iiii iiit iira iita iitr iitt irai irar iri- iria irra irri irta irti itaa itai itar itat itia itra itri itta ivai ivar ivbv raab raat raba rabb rabi raia raii rair rait rara rarb rari rata rati ratt rava ravi rbbb rbbr riaa riab riai riat rib- riba riia riri rita riti ritt riva rrat rrrr rtai rtva rtvi taa- taar taat taba tabb tabi taia tair tait tara tarb tari tarr tart tata tatb tati tatr tatt tatv tava tavi tbar tbit tbrb tbta tbvi tiaa tiab tiar tiba tibi tiit tira tirb tiri tirr tita titi titt tiva tivi traa trab trai trat trav tri- tria trib trit trra trtr ttab ttbb tttt tvri tvrr tvtv vaar vaat vaia vair vait vara vari varr vart vata vati vatt vava viar viii vira virb viri virr virt vita viti vitt viva vivi vrai vrav vrba vria vt-i vvvv