aaaa aaab aaac aaad aaba aabb aabc aabd aabt aaca aacb aacc aacd aact aacu aada aadc aadt aadu aata aatc aatt abaa abab abac abad abat abau abb- abba abbb abbt abca abcb abcc abcd abct abda abdu abta abtu abua abud abut ac-t acaa acab acac acad acat acba acca accc accd acct accu acda acdb acdc acdt acta actc actt actu acu- acut adaa adab adac adad adat adba adbc adcc adda addc addd addu adta adua adub at-t ataa atab atac atad atat atca atcc atdt atta attu atua atub atuc auaa auca auct audc aut- baaa baad baat baba babb babu bac- baca bacc bact bada badb badd badu bata batc batt batu bau- baud bbad bbau bbbb bbdd bcaa bcat bcbc bcca bccc bcda bctc bcuc bdbc bddc btaa btcc btdt bttb buad buat buba bubb bubu buca bucc bucu buda budb budd budu but- buta butt c-cd caaa caab caac caat caba cabu cac- caca cacc cada cadc cadd cadu cat- cata catb catc catd catt catu cauc caut cbac cbat cbbc cbca cbcc cbct cbcu cbdb cbdc cbta cbtc ccaa ccab ccac ccad ccat ccba ccbc ccca cccb cccc cccu ccdc cctb cctc cctt ccuc ccut cdaa cdac cdad cdba cdda cddb ctab ctba ctca ctta cuau cub- cuba cubb cuca cucc cuda cut- cuta cutc cutt daab daad daau daba dabb dabt dabu daca dact dada dadu data datt datu daub daud daut dbcc dbtt dcbc dcca dccb dccc dcct dccu dcdb dctc dddd ddub dtaa dtac dtcc duaa duab duad duat dub- duba dubb dubc dubu duca duct duda dudd dudu duta duut taa- taat taba tabb tabc tabu taca tacc tact tada tata tatb tatt tatu taua taub tauc taut tbca tbcb tbcc tbcd tbta tcad tcca tccc tccu tcdd tctc tdac tddb ttab ttbb tttt tuat tuba tubb tubu tuca tucc tudu tuta tutt tutu uabc uaca uata uatu uaua ubac ubba ubud ucad ucat ucbc ucca ucdc ucdd ucua ucut udaa udad udau udbc udca utac utau uttu uuta uuuu