a-a a-c a-t aaa aac aae aaf aas aat aau aax ac- aca acc ace acf acs act acu acx aea aec aee aef aes aet aeu aex af- afa afc afe aff afs aft afu afx as- asa asc ase asf ass ast asu asx at- ata atc ate atf ats att atu atx au- aua auc aue auf aus aut aux ax- axa axe axs axt axx c-- caa cac cae caf cas cat cau cax cca ccc cce ccf ccs cct ccu ccx ce- cea cec cee cef ces cet ceu cex cfa cfc cfe cff cfs cft cfu cfx csa csc cse csf css cst csu csx cta ctc cte ctf cts ctt ctu ctx cua cuc cue cuf cus cut cuu cxc cxf cxs cxt cxx eaa eac eae eaf eas eat eau eax ec- eca ecc ece ecf ecs ect ecu ecx eea eec eee eef ees eet eex ef- efa efc efe eff efs eft efx es- esa esc ese esf ess est esu esx eta etc ete etf ets ett etu etx eu- eua euc eue euf eus eut eux ex- exa exc exe exs ext exu exx faa fac fae faf fas fat fau fax fca fcc fce fcf fcs fct fcu fcx fea fec fee fef fes fet feu fex ffa ffc ffe fff ffs fft ffu ffx fsa fsc fse fsf fss fst fsu fsx fta ftc fte ftf fts ftt ftu ftx fua fue fuf fus fut fuu fux fxe fxs fxt fxu fxx saa sac sae saf sas sat sau sax sca scc sce scf scs sct scu scx se- sea sec see sef ses set seu sex sfa sfc sfe sff sfs sft sfu sfx ss- ssa ssc sse ssf sss sst ssu ssx sta stc ste stf sts stt stu stx sua suc sue suf sus sut suu sux sxc sxs sxt sxu t-x taa tac tae taf tas tat tau tax tca tcc tce tcf tcs tct tcu tcx te- tea tec tee tef tes tet teu tex tfa tfc tfe tff tfs tft tfu tfx tsa tsc tse tsf tss tst tsu tsx tta ttc tte ttf tts ttt ttu ttx tua tuc tue tuf tus tut tuu tux txe txf txs txt txu ua- uaa uac uae uaf uas uat uau uca ucc uce ucf ucs uct ucu uea uec uee uef ues uet ufa ufc ufe uff ufs uft ufu ufx usa usc use usf uss ust usu usx uta utc ute utf uts utt utu utx uua uuc uue uus uut uuu uxc uxf uxt uxu xaa xac xaf xas xat xau xcf xcx xee xes xet xeu xex xfa xfe xfs xft xfx xsa xsc xss xst xtc xtf xts xtx xue xus xxx