bbb bbe bbf bbi bbk bbl be- beb bee bef bei bek bel bfb bfe bff bfi bfl bi- bib bie bif bii bik bil bkb bke bkf bkk bkl blb ble blf bli blk bll ebb ebe ebf ebi ebk ebl eeb eee eef eek eel ef- efb efe eff efi efl eib eie eif eii eik eil ekb eke ekf eki ekl elb ele elf eli elk ell fbb fbe fbf fbi fbk fbl feb fee fef fei fek fel ffe fff ffi ffk ffl fib fie fif fii fik fil fkb fkf fki fkk fkl flb fle flf fli fll i-f ibb ibe ibf ibi ibk ibl ie- iee ief iei iek iel ifb ife iff ifi ifl iib iie iif iii iil ikb ike ikf iki ikk ikl il- ilb ile ilf ili ilk ill kbb kbe kbf kbi kbk kbl ke- keb kee kef kei kek kel kff kfi kib kie kif kii kik kil kkb kke kki kkk kkl kl- klb klf kli lbb lbe lbf lbi lbk lbl leb lee lef lei lek lel lfb lfe lff lfi lfk lfl lib lie lif lii lik lil lkb lkl llb lle llf lli llk lll