a-a a-c a-t aaa aac aae aas aat aau aax ac- aca acc ace acs act acu acx aea aec aee aes aet aeu aex as- asa asc ase ass ast asu asx at- ata atc ate ats att atu atx au- aua auc aue aus aut aux ax- axa axe axs axt axx c-- caa cac cae cas cat cau cax cca ccc cce ccs cct ccu ccx ce- cea cec cee ces cet ceu cex csa csc cse css cst csu csx cta ctc cte cts ctt ctu ctx cua cuc cue cus cut cuu cxc cxs cxt cxx eaa eac eae eas eat eau eax ec- eca ecc ece ecs ect ecu ecx eea eec eee ees eet eex es- esa esc ese ess est esu esx eta etc ete ets ett etu etx eu- eua euc eue eus eut eux ex- exa exc exe exs ext exu exx saa sac sae sas sat sau sax sca scc sce scs sct scu scx se- sea sec see ses set seu sex ss- ssa ssc sse sss sst ssu ssx sta stc ste sts stt stu stx sua suc sue sus sut suu sux sxc sxs sxt sxu t-x taa tac tae tas tat tau tax tca tcc tce tcs tct tcu tcx te- tea tec tee tes tet teu tex tsa tsc tse tss tst tsu tsx tta ttc tte tts ttt ttu ttx tua tuc tue tus tut tuu tux txe txs txt txu ua- uaa uac uae uas uat uau uca ucc uce ucs uct ucu uea uec uee ues uet usa usc use uss ust usu usx uta utc ute uts utt utu utx uua uuc uue uus uut uuu uxc uxt uxu xaa xac xas xat xau xcx xee xes xet xeu xex xsa xsc xss xst xtc xts xtx xue xus xxx