-er bbb bbe bbf bbi bbk bbr be- beb bee bef bei bek ber bfb bfe bff bfi bfr bi- bib bie bif bii bik bir bkb bke bkf bkk bkr brb bre brf bri brk brr ebb ebe ebf ebi ebk ebr eeb eee eef eek eer ef- efb efe eff efi efr eib eie eif eii eik eir ekb eke ekf eki ekr erb ere erf eri erk err fbb fbe fbf fbi fbk fbr feb fee fef fei fek fer ffe fff ffi ffk ffr fib fie fif fii fik fir fkb fkf fki fkk frb fre frf fri frk frr i-f ibb ibe ibf ibi ibk ibr ie- iee ief iei iek ier ifb ife iff ifi ifr iib iie iif iii iir ikb ike ikf iki ikk ikr ir- irb ire irf iri irk irr kbb kbe kbf kbi kbk kbr ke- keb kee kef kei kek ker kff kfi kib kie kif kii kik kir kkb kke kki kkk kkr krf kri krk krr rbb rbe rbf rbi rbk rbr re- reb ree ref rei rek rer rfb rfe rff rfi rfk rfr rib rie rif rii rik rir rkb rke rkf rkk rrb rrf rri rrk rrr