a-a a-b a-t aaa aab aae aas aat aau aax ab- aba abb abe abs abt abu abx aea aeb aee aes aet aeu aex as- asa asb ase ass ast asu asx at- ata atb ate ats att atu atx au- aua aub aue aus aut aux ax- axa axe axs axt axx b-u baa bab bae bas bat bau bax bba bbb bbe bbs bbt bbu bbx be- bea beb bee bes bet beu bex bsa bsb bse bss bst bsu bsx bta btb bte bts btt btu btx bua bub bue bus but buu bux bxb bxx eaa eab eae eas eat eau eax eba ebb ebe ebs ebt ebu ebx eea eeb eee ees eet eex es- esa esb ese ess est esu esx eta etb ete ets ett etu etx eu- eua eub eue eus eut eux ex- exa exe exs ext exu exx saa sab sae sas sat sau sax sba sbb sbe sbs sbt sbu sbx se- sea seb see ses set seu sex ss- ssa ssb sse sss sst ssu ssx sta stb ste sts stt stu stx sua sub sue sus sut suu sux sxs sxt sxu t-x taa tab tae tas tat tau tax tba tbb tbe tbs tbt tbu te- tea teb tee tes tet teu tex tsa tsb tse tss tst tsu tsx tta ttb tte tts ttt ttu ttx tua tub tue tus tut tuu tux txe txs txt txu ua- uaa uab uae uas uat uau uba ubb ube ubs ubt ubu ubx uea ueb uee ues uet usa usb use uss ust usu usx uta utb ute uts utt utu utx uua uue uus uut uuu uxb uxt uxu xaa xas xat xau xbe xbx xee xes xet xeu xex xsa xsb xss xst xts xtx xue xus xxx