a-ii aaaa aaab aaai aaar aaba aabb aabi aabt aaib aaii aara aari aart aata aatt abaa abab abai abar abat abb- abba abbb abbi abbr abbt abia abib abir abit abra abri abta aiai aiba aiia aiib aiir aira airi airt aita aiti aitr aitt arab arai arar arat arba arbi aria arib arii arit arr- arra arri arrr arrt arta arti artr at-t ataa atab atai atar atat atia atit atra atri atta atti attr ba-i baaa baar baat baba babb babi babr baia baib bair bait bar- bara barb bari barr bart bata bati batt bbbb biar biat biba bibb bibi bira birb biri birr birt bita bitt brab brai brat bria brit brrr btaa btrt bttb iaaa iaai iaat iaba iaia iara iart iata iati 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 raab raat raba rabb rabi raia raii rair rait rara rarb rari rata rati ratt rbbb rbbr riaa riab riai riat rib- riba riia riri rita riti ritt rrat rrrr rtai taa- taar taat taba tabb tabi taia tair tait tara tarb tari tarr tart tata tatb tati tatr tatt tbar tbit tbrb tbta tiaa tiab tiar tiba tibi tiit tira tirb tiri tirr tita titi titt traa trab trai trat tri- tria trib trit trra trtr ttab ttbb tttt