a-a a-t aaa aas aat aau aax as- asa ass ast asu asx at- ata ats att atu atx au- aua aus aut aux ax- axa axs axt axx saa sas sat sau sax ss- ssa sss sst ssu ssx sta sts stt stu stx sua sus sut suu sux sxs sxt sxu t-x taa tas tat tau tax tsa tss tst tsu tsx tta tts ttt ttu ttx tua tus tut tuu tux txs txt txu ua- uaa uas uat uau usa uss ust usu usx uta uts utt utu utx uua uus uut uuu uxt uxu xaa xas xat xau xsa xss xst xts xtx xus xxx