aaaa aaab aaac aaba aabb aabc aabt aaca aacb aacc aact aacu aata aatc aatt abaa abab abac abat abau abb- abba abbb abbt abca abcb abcc abct abta abtu abua abut ac-t acaa acab acac acat acba acca accc acct accu acta actc actt actu acu- acut at-t ataa atab atac atat atca atcc atta attu atua atub atuc auaa auca auct aut- baaa baat baba babb babu bac- baca bacc bact bata batc batt batu bau- bbau bbbb bcaa bcat bcbc bcca bccc bctc bcuc btaa btcc bttb buat buba bubb bubu buca bucc bucu but- buta butt caaa caab caac caat caba cabu cac- caca cacc cat- cata catb catc catt catu cauc caut cbac cbat cbbc cbca cbcc cbct cbcu cbta cbtc ccaa ccab ccac ccat ccba ccbc ccca cccb cccc cccu cctb cctc cctt ccuc ccut ctab ctba ctca ctta cuau cub- cuba cubb cuca cucc cut- cuta cutc cutt taa- taat taba tabb tabc tabu taca tacc tact tata tatb tatt tatu taua taub tauc taut tbca tbcb tbcc tbta tcca tccc tccu tctc ttab ttbb tttt tuat tuba tubb tubu tuca tucc tuta tutt tutu uabc uaca uata uatu uaua ubac ubba ucat ucbc ucca ucua ucut utac utau uttu uuta uuuu