b-u bbb bbe bbf bbi bbl bbu bbx be- beb bee bef bei bel beu bex bfb bfe bff bfi bfl bfu bfx bi- bib bie bif bii bil biu bix blb ble blf bli bll blu blx bub bue buf bui bul buu bux bxb bxi bxl bxx ebb ebe ebf ebi ebl ebu ebx eeb eee eef eel eex ef- efb efe eff efi efl efx eib eie eif eii eil eiu eix elb ele elf eli ell elu elx eu- eub eue euf eui eul eux ex- exe exi exl exu exx fbb fbe fbf fbi fbl fbu fbx feb fee fef fei fel feu fex ffe fff ffi ffl ffu ffx fib fie fif fii fil fiu fix flb fle flf fli fll flu flx fub fue fuf fui ful fuu fux fxe fxi fxu fxx i-f ibb ibe ibf ibi ibl ibu ibx ie- iee ief iei iel iex ifb ife iff ifi ifl ifu ifx iib iie iif iii iil iiu iix il- ilb ile ilf ili ill ilu ilx iu- iub iue iui ixe ixi ixl lbb lbe lbf lbi lbl lbu lbx leb lee lef lei lel leu lex lfb lfe lff lfi lfl lfu lfx lib lie lif lii lil liu lix llb lle llf lli lll llu lub lue luf lui lul luu lux lxi lxx ubb ube ubf ubi ubl ubu ubx ueb uee uef uei uel ufe uff ufi ufl ufu ufx uib uie uif uii uil uiu ulb ule ulf uli ull ulu uue uuu uxb uxf uxu xbe xbl xbx xee xel xeu xex xfe xfl xfx xie xii xiu xix xlb xlf xli xue xui xul xxi xxl xxx