a-a a-c a-t aaa aac aat aau aax ac- aca acc act acu acx at- ata atc att atu atx au- aua auc aut aux ax- axa axt axx c-- caa cac cat cau cax cca ccc cct ccu ccx cta ctc ctt ctu ctx cua cuc cut cuu cxc cxt cxx t-x taa tac tat tau tax tca tcc tct tcu tcx tta ttc ttt ttu ttx tua tuc tut tuu tux txt txu ua- uaa uac uat uau uca ucc uct ucu uta utc utt utu utx uua uuc uut uuu uxc uxt uxu xaa xac xat xau xcx xtc xtx xxx