b-u bbb bbe bbl bbt bbu bbx be- beb bee bel bet beu bex blb ble bll blt blu blx btb bte btl btt btu btx bub bue bul but buu bux bxb bxl bxx ebb ebe ebl ebt ebu ebx eeb eee eel eet eex elb ele ell elt elu elx etb ete etl ett etu etx eu- eub eue eul eut eux ex- exe exl ext exu exx lbb lbe lbl lbt lbu lbx leb lee lel let leu lex llb lle lll llt llu ltb lte ltl ltt ltu ltx lub lue lul lut luu lux lxx t-x tbb tbe tbl tbt tbu te- teb tee tel tet teu tex tle tll tlt tlu tlx ttb tte ttl ttt ttu ttx tub tue tul tut tuu tux txe txl txt txu ubb ube ubl ubt ubu ubx ueb uee uel uet ulb ule ull ult ulu utb ute utl utt utu utx uue uut uuu uxb uxt uxu xbe xbl xbx xee xel xet xeu xex xlb xlt xtx xue xul xxl xxx