b-u bbb bbe bbi bbl bbu bbx be- beb bee bei bel beu bex bi- bib bie bii bil biu bix blb ble bli bll blu blx bub bue bui bul buu bux bxb bxi bxl bxx ebb ebe ebi ebl ebu ebx eeb eee eel eex eib eie eii eil eiu eix elb ele eli ell elu elx eu- eub eue eui eul eux ex- exe exi exl exu exx ibb ibe ibi ibl ibu ibx ie- iee iei iel iex iib iie iii iil iiu iix il- ilb ile ili ill ilu ilx iu- iub iue iui ixe ixi ixl lbb lbe lbi lbl lbu lbx leb lee lei lel leu lex lib lie lii lil liu lix llb lle lli lll llu lub lue lui lul luu lux lxi lxx ubb ube ubi ubl ubu ubx ueb uee uei uel uib uie uii uil uiu ulb ule uli ull ulu uue uuu uxb uxu xbe xbl xbx xee xel xeu xex xie xii xiu xix xlb xli xue xui xul xxi xxl xxx