aaaa aaab aaac aaba aabb aabc aabt aaca aacb aacc aaco aact aaoo aata aatc aatt abaa abab abac abag abat abb- abba abbb abbo abbt abca abcb abcc abct aboa abob aboo abot abta ac-t acaa acab acac acag acat acba acca accc acco acct acga acoa acog acot acta actc actg acto actt ag-o agac agag agao agat agba agbo agca agcc agco agct agga agob agog agoo agot agta aoba aoca aotc at-t ataa atab atac atat atca atcc atco atgo atob atoc atot atta atto baaa baat baba babb babo bac- baca bacc baco bact baga bagg bago bagt bata batc bato batt bbbb bbga bcaa bcat bcbc bcbg bcca bccc bctc bgca boab boac boag boat boba bobb bobo boca boco boga bogg bogo bogt boob booc boog boot bota botb boto bott btaa btcc btob bttb c-bo caaa caab caac caat caba cabg cabo cac- caca cacc caco caga cagg cago cat- cata catb catc cato catt cbac cbat cbbc cbca cbcc cbct cbga cbgb cbot cbta cbtc ccaa ccab ccac ccag ccat ccba ccbc ccca cccb cccc ccga ccgc ccgt ccob ccoc cctb cctc cctt cgac cgcc cgcg coag coat coba cobb cobo coca coco coct cogo coob coot cota cotb cotc coto cott ctab ctag ctba ctca ctot ctta gaba gabb gabo gabt gaga gagg gago gata gatc gato gatt gbag gbbo gc-c gcaa gcat gcbc gccc gcoa gctc ggbt gggg goat goba gobo goca goga gogo goog goot gota goto gott gtaa gtco gtta obba obbo obot ocab ocac ocat ocbc occa occc occt ocga oct- octa octo ogb ogba ogoa ogog ooaa ooba oooo ootb otac oto- otog otoo otta otto taa- taag taat taba tabb tabc tabo taca tacc taco tact taga tagg tago taoa tata tatb tato tatt tbca tbcb tbcc tbta tcca tccc tcga tctc tgcc tgtc toab toat toba tobo tobt toca toco toga togo togt tooa toot tota totc toto tott ttab ttbb tttt