-er -ic bbb bbc bbe bbg bbi bbn bbr bbs bcb bcc bce bcg bci bcn bcr bcs be- beb bec bee beg bei ben ber bes bgb bgc bge bgg bgi bgn bgr bgs bi- bib bic bie big bii bin bir bis bnb bnc bne bng bni bnn bnr bns brb bre brg bri brn brr brs bsb bsc bse bsg bsi bsn bsr bss c-- cbb cbc cbe cbg cbi cbn cbr cbs ccb ccc cce ccg cci ccn ccr ccs ce- ceb cec cee ceg cei cen cer ces cgb cgc cge cgg cgi cgn cgr cgs ci- cib cic cie cig cii cin cir cis cn- cnb cnc cne cng cni cnn cnr cns crb crc cre crg cri crn crr crs csb csc cse csg csi csn csr css ebb ebc ebe ebg ebi ebn ebr ebs ec- ecb ecc ece ecg eci ecn ecr ecs eeb eec eee eeg een eer ees egb egc ege egg egi egn egr egs eib eic eie eig eii ein eir eis en- enb enc ene eng eni enn enr ens erb erc ere erg eri ern err ers es- esb esc ese esg esi esn esr ess gbc gbe gbg gbi gbn gbr gbs gcb gcc gce gcg gci gcn gcr gcs ge- geb gec gee geg gei gen ger ges ggb ggc ggg ggi ggn ggr ggs gib gic gie gig gii gin gir gis gnb gnc gne gni gnn gnr gns grb grc gre grg gri grn grr grs gsb gsc gse gsg gsi gsn gsr gss ibb ibc ibe ibg ibi ibn ibr ibs icb icc ice icg ici icn icr ics ie- iec iee ieg iei ien ier ies igb igc ige igg igi ign igr igs iib iic iie iii iin iir iis in- inb inc ine ing ini inn inr ins ir- irb irc ire irg iri irn irr irs is- isb isc ise isg isi isn isr iss n-i nbb nbc nbe nbg nbi nbn nbr nbs ncb ncc nce ncg nci ncn ncr ncs ne- neb nec nee neg nei nen ner nes ngb ngc nge ngg ngi ngn ngs nib nic nie nig nii nin nir nis nnb nnc nne nng nni nnn nns nrb nrc nre nrg nri nrn nrr nrs nsb nsc nse nsg nsi nsn nsr nss rbb rbc rbe rbg rbi rbn rbr rbs rcb rcc rce rcg rci rcn rcr rcs re- reb rec ree reg rei ren rer res rgb rgc rge rgg rgi rgn rgr rgs rib ric rie rig rii rin rir ris rnb rnc rng rni rnn rnr rns rrb rrc rrg rri rrn rrr rrs rsb rsc rse rsg rsi rsn rsr rss sbb sbc sbe sbg sbi sbn sbr sbs scb scc sce scg sci scn scr scs se- seb sec see seg sei sen ser ses sgb sgc sge sgg sgi sgn sgr sgs sib sic sie sig sii sin sir sis snb snc sne sng sni snn snr sns sr- srb src sre srg sri srn srr srs ss- ssb ssc sse ssg ssi ssn ssr sss