a-ii aaaa aaab aaai aaap aaba aabb aabi aabp aabt aaib aaii aapa aapi aapt aata aatt abaa abab abai abap abat abb- abba abbb abbi abbt abia abib abit abpa abpi abpp abta aiai aiba aiia aiib aipa aipi aita aiti aitt apai apap apat apba api- apia apip apit appa appt apta apti aptt at-t ataa atab atai atap atat atia atip atit atta atti attp ba-i baaa baat baba babb babi baia baib bait bapa bapi bapp bapt bata bati batt bbbb biap biat biba bibb bibi bipa bipp bita bitt bpai bpti btaa btbp bttb iaaa iaai iaap iaat iaba iaia iapa iapp iapt iata iati ibat ibia ibtb iiii iiit iipa iita iitt ipat ipba ippa ipta itaa itai itap itat itia itpa itta paap paat paba pabt paia paib paip pait papa papb papi papp pata pati patt pbpa piai piat pibb pibi piia piip pipa pipi pipp pita piti pitt ppap ppib pppa pppp ppta pptt ptab taa- taat taba tabb tabi taia taip tait tapa tapi tapp tapt tata tatb tati tatt tbit tbta tbtp tiaa tiab tiba tibi tiit tip- tipa tipi tipp tipt tita titi titp titt tpap tpia tppa tppp tptp ttab ttbb tttt