a-fu aaaa aaab aaaf aaba aabb aabt aafa aafb aaff aata aatf aatt abaa abab abaf abat abau abb- abba abbb abbt abff abta abtu abua abuf abut afaa afat affa afft afta afua at-t ataa atab atat atfb atta attu atua atub auaa aut- baaa baaf baat baba babb babu baff baft bata batf batt batu bau- bauf bbau bbbb bfta bftt btaa btaf bttb buat buba bubb bubu buff but- buta butt faaa faba fabu fafa faff fata fatf fatt faut ffff fftf ftub fuat fubb fubu fuff fufu futa futu taa- taaf taat taba tabb tabu tafa taff taft tata tatb tatt tatu taua taub taut tbaf tbta ttab ttbb ttfa ttff tttt tuat tuba tubb tubu tufa tuff tuft tufu tuta tutt tutu uafa uata uatu uaua ubba ubtf uffa utau uttu uuta uutf uuuu