a-a a-b a-t aaa aab aae aan aat aau aax ab- aba abb abe abn abt abu abx aea aeb aee aen aet aeu aex an- ana anb ane ann ant anu anx at- ata atb ate atn att atu atx au- aua aub aue aun aut aux ax- axa axe axn axt axx b-u baa bab bae ban bat bau bax bba bbb bbe bbn bbt bbu bbx be- bea beb bee ben bet beu bex bna bnb bne bnn bnt bnu bnx bta btb bte btn btt btu btx bua bub bue bun but buu bux bxb bxn bxx eaa eab eae ean eat eau eax eba ebb ebe ebn ebt ebu ebx eea eeb eee een eet eex en- ena enb ene enn ent enu eta etb ete etn ett etu etx eu- eua eub eue eun eut eux ex- exa exe ext exu exx naa nab nae nan nat nau nax nba nbb nbe nbn nbt nbu nbx ne- nea neb nee nen net neu nex nna nnb nne nnn nnt nnu nta ntb nte ntn ntt ntu ntx nua nub nue nun nut nuu nux nxt t-x taa tab tae tan tat tau tax tba tbb tbe tbn tbt tbu te- tea teb tee ten tet teu tex tna tnb tne tnn tnt tnx tta ttb tte ttn ttt ttu ttx tua tub tue tun tut tuu tux txe txn txt txu ua- uaa uab uae uan uat uau uba ubb ube ubn ubt ubu ubx uea ueb uee uen uet un- una unb une unn unt unu unx uta utb ute utn utt utu utx uua uue uun uut uuu uxb uxt uxu xaa xan xat xau xbe xbx xee xen xet xeu xex xna xnu xtx xue xun xxx