-er -ic bbb bbc bbe bbf bbg bbi bbn bbr bcb bcc bce bcf bcg bci bcn bcr be- beb bec bee bef beg bei ben ber bfb bfc bfe bff bfg bfi bfn bfr bgb bgc bge bgf bgg bgi bgn bgr bi- bib bic bie bif big bii bin bir bnb bnc bne bnf bng bni bnn bnr brb bre brf brg bri brn brr c-- cbb cbc cbe cbf cbg cbi cbn cbr ccb ccc cce ccf ccg cci ccn ccr ce- ceb cec cee cef ceg cei cen cer cfb cfc cfe cff cfg cfi cfn cfr cgb cgc cge cgg cgi cgn cgr ci- cib cic cie cif cig cii cin cir cn- cnb cnc cne cnf cng cni cnn cnr crb crc cre crf crg cri crn crr ebb ebc ebe ebf ebg ebi ebn ebr ec- ecb ecc ece ecf ecg eci ecn ecr eeb eec eee eef eeg een eer ef- efb efc efe eff efg efi efr egb egc ege egf egg egi egn egr eib eic eie eif eig eii ein eir en- enb enc ene enf eng eni enn enr erb erc ere erf erg eri ern err fbb fbc fbe fbf fbg fbi fbn fbr fcb fcc fce fcf fcg fci fcn fcr feb fec fee fef feg fei fen fer ffc ffe fff ffg ffi ffn ffr fgb fgc fge fgf fgg fgi fgn fgr fib fic fie fif fig fii fin fir fnb fnc fne fnf fng fni fnn fnr frb frc fre frf frg fri frn frr gbc gbe gbf gbg gbi gbn gbr gcb gcc gce gcf gcg gci gcn gcr ge- geb gec gee gef geg gei gen ger gfb gfc gfe gff gfi gfr ggb ggc ggg ggi ggn ggr gib gic gie gif gig gii gin gir gnb gnc gne gnf gni gnn gnr grb grc gre grf grg gri grn grr i-f ibb ibc ibe ibf ibg ibi ibn ibr icb icc ice icf icg ici icn icr ie- iec iee ief ieg iei ien ier ifb ifc ife iff ifg ifi ifn ifr igb igc ige igf igg igi ign igr iib iic iie iif iii iin iir in- inb inc ine inf ing ini inn inr ir- irb irc ire irf irg iri irn irr n-i nbb nbc nbe nbf nbg nbi nbn nbr ncb ncc nce ncf ncg nci ncn ncr ne- neb nec nee nef neg nei nen ner nfb nfc nfe nff nfi nfn nfr ngb ngc nge ngf ngg ngi ngn nib nic nie nif nig nii nin nir nnb nnc nne nnf nng nni nnn nrb nrc nre nrf nrg nri nrn nrr rbb rbc rbe rbf rbg rbi rbn rbr rcb rcc rce rcf rcg rci rcn rcr re- reb rec ree ref reg rei ren rer rfb rfc rfe rff rfg rfi rfn rfr rgb rgc rge rgf rgg rgi rgn rgr rib ric rie rif rig rii rin rir rnb rnc rng rni rnn rnr rrb rrc rrf rrg rri rrn rrr