a-a a-c a-t aaa aac aas aat aau aax ac- aca acc acs act acu acx as- asa asc ass ast asu asx at- ata atc ats att atu atx au- aua auc aus aut aux ax- axa axs axt axx c-- caa cac cas cat cau cax cca ccc ccs cct ccu ccx csa csc css cst csu csx cta ctc cts ctt ctu ctx cua cuc cus cut cuu cxc cxs cxt cxx saa sac sas sat sau sax sca scc scs sct scu scx ss- ssa ssc sss sst ssu ssx sta stc sts stt stu stx sua suc sus sut suu sux sxc sxs sxt sxu t-x taa tac tas tat tau tax tca tcc tcs tct tcu tcx tsa tsc tss tst tsu tsx tta ttc tts ttt ttu ttx tua tuc tus tut tuu tux txs txt txu ua- uaa uac uas uat uau uca ucc ucs uct ucu usa usc uss ust usu usx uta utc uts utt utu utx uua uuc uus uut uuu uxc uxt uxu xaa xac xas xat xau xcx xsa xsc xss xst xtc xts xtx xus xxx