-er bbb bbe bbf bbi bbr be- beb bee bef bei ber bez bfb bfe bff bfi bfr bfz bi- bib bie bif bii bir biz brb bre brf bri brr brz bze bzf bzr bzz ebb ebe ebf ebi ebr eeb eee eef eer ef- efb efe eff efi efr eib eie eif eii eir erb ere erf eri err erz eze ezf ezr ezz fbb fbe fbf fbi fbr feb fee fef fei fer fez ffe fff ffi ffr ffz fib fie fif fii fir fiz frb fre frf fri frr i-f ibb ibe ibf ibi ibr ibz ie- iee ief iei ier ifb ife iff ifi ifr ifz iib iie iif iii iir ir- irb ire irf iri irr ize izi izz rbb rbe rbf rbi rbr re- reb ree ref rei rer rez rfb rfe rff rfi rfr rfz rib rie rif rii rir riz rrb rrf rri rrr rzb rze zbb zbr zeb zee zef zer zez zfr zib zie zif zir ziz zzr zzz