aaaa aaac aaca aacc aaco aact aaoo aata aatc aatt ac-t acaa acac acat acca accc acco acct acoa acot acta actc acto actt aoca aotc at-t at-x ataa atac atat atax atca atcc atco atoc atot atta atto axat axo- axoa axto axxo caaa caac caat cac- caca cacc caco cat- cata catc cato catt caxa ccaa ccac ccat ccca cccc ccoc cctc cctt coat coax coca coco coct coot cota cotc coto cott coxa ctca ctot ctta cxxx ocac ocat occa occc occt oct- octa octo ooaa oooo otac oto- otoo otta otto oxa- oxo- oxox oxxo taa- taat taca tacc taco tact taoa tata tato tatt tax- taxa taxo taxt tcca tccc tctc toat toca toco tooa toot tota totc toto tott tox- toxa toxo toxt tttt txaa xact xcat xoca xoco xoxo xxxo xxxx