-er bbb bbe bbf bbg bbi bbk bbn bbr be- beb bee bef beg bei bek ben ber bfb bfe bff bfg bfi bfn bfr bgb bge bgf bgg bgi bgk bgn bgr bi- bib bie bif big bii bik bin bir bkb bke bkf bkg bkk bkn bkr bnb bne bnf bng bni bnk bnn bnr brb bre brf brg bri brk brn brr ebb ebe ebf ebg ebi ebk ebn ebr eeb eee eef eeg eek een eer ef- efb efe eff efg efi efr egb ege egf egg egi egn egr eib eie eif eig eii eik ein eir ekb eke ekf ekg eki ekr en- enb ene enf eng eni enk enn enr erb ere erf erg eri erk ern err fbb fbe fbf fbg fbi fbk fbn fbr feb fee fef feg fei fek fen fer ffe fff ffg ffi ffk ffn ffr fgb fge fgf fgg fgi fgn fgr fib fie fif fig fii fik fin fir fkb fkf fkg fki fkk fnb fne fnf fng fni fnk fnn fnr frb fre frf frg fri frk frn frr gbe gbf gbg gbi gbk gbn gbr ge- geb gee gef geg gei gek gen ger gfb gfe gff gfi gfk gfr ggb ggg ggi ggn ggr gib gie gif gig gii gik gin gir gkb gkn gnb gne gnf gni gnn gnr grb gre grf grg gri grk grn grr i-f ibb ibe ibf ibg ibi ibk ibn ibr ie- iee ief ieg iei iek ien ier ifb ife iff ifg ifi ifn ifr igb ige igf igg igi igk ign igr iib iie iif iii iin iir ikb ike ikf iki ikk ikr in- inb ine inf ing ini ink inn inr ir- irb ire irf irg iri irk irn irr kbb kbe kbf kbi kbk kbn kbr ke- keb kee kef keg kei kek ken ker kff kfg kfi kgb kgf kgi kib kie kif kig kii kik kin kir kkb kke kki kkk kkn kkr kn- kne knf kng kni knk knn knr krf krg kri krk krn krr n-i nbb nbe nbf nbg nbi nbk nbn nbr ne- neb nee nef neg nei nek nen ner nfb nfe nff nfi nfk nfn nfr ngb nge ngf ngg ngi ngk ngn nib nie nif nig nii nik nin nir nke nkf nki nkk nkn nkr nnb nne nnf nng nni nnk nnn nrb nre nrf nrg nri nrk nrn nrr rbb rbe rbf rbg rbi rbk rbn rbr re- reb ree ref reg rei rek ren rer rfb rfe rff rfg rfi rfk rfn rfr rgb rge rgf rgg rgi rgk rgn rgr rib rie rif rig rii rik rin rir rkb rke rkf rkg rkk rnb rng rni rnn rnr rrb rrf rrg rri rrk rrn rrr