a-a a-b a-t aaa aab aae aat aau aav ab- aba abb abe abt abu abv aea aeb aee aet aeu aev at- ata atb ate att atu atv au- aua aub aue aut auv av- ava avb ave avt avu b-u baa bab bae bat bau bav bba bbb bbe bbt bbu be- bea beb bee bet beu bev bta btb bte btt btu btv bua bub bue but buu bva bvb bve bvt bvu bvv eaa eab eae eat eau eav eba ebb ebe ebt ebu ebv eea eeb eee eet eev eta etb ete ett etu etv eu- eua eub eue eut euv eva evb eve evt evv taa tab tae tat tau tav tba tbb tbe tbt tbu tbv te- tea teb tee tet teu tev tta ttb tte ttt ttu ttv tua tub tue tut tuu tuv tva tvb tve tvt tvu ua- uaa uab uae uat uau uav uba ubb ube ubt ubu ubv uea ueb uee uet uta utb ute utt utu utv uua uue uut uuu uva uvb uve uvu uvv v-a v-e vaa vab vae vat vau vav vba vbv vea veb vee vet veu vta vtb vte vtt vtu vtv vue vut vuv vva vvb vvt vvv