-er -ic bbb bbc bbe bbg bbi bbr bbs bcb bcc bce bcg bci bcr bcs be- beb bec bee beg bei ber bes bgb bgc bge bgg bgi bgr bgs bi- bib bic bie big bii bir bis brb bre brg bri brr brs bsb bsc bse bsg bsi bsr bss c-- cbb cbc cbe cbg cbi cbr cbs ccb ccc cce ccg cci ccr ccs ce- ceb cec cee ceg cei cer ces cgb cgc cge cgg cgi cgr cgs ci- cib cic cie cig cii cir cis crb crc cre crg cri crr crs csb csc cse csg csi csr css ebb ebc ebe ebg ebi ebr ebs ec- ecb ecc ece ecg eci ecr ecs eeb eec eee eeg eer ees egb egc ege egg egi egr egs eib eic eie eig eii eir eis erb erc ere erg eri err ers es- esb esc ese esg esi esr ess gbc gbe gbg gbi gbr gbs gcb gcc gce gcg gci gcr gcs ge- geb gec gee geg gei ger ges ggb ggc ggg ggi ggr ggs gib gic gie gig gii gir gis grb grc gre grg gri grr grs gsb gsc gse gsg gsi gsr gss ibb ibc ibe ibg ibi ibr ibs icb icc ice icg ici icr ics ie- iec iee ieg iei ier ies igb igc ige igg igi igr igs iib iic iie iii iir iis ir- irb irc ire irg iri irr irs is- isb isc ise isg isi isr iss rbb rbc rbe rbg rbi rbr rbs rcb rcc rce rcg rci rcr rcs re- reb rec ree reg rei rer res rgb rgc rge rgg rgi rgr rgs rib ric rie rig rii rir ris rrb rrc rrg rri rrr rrs rsb rsc rse rsg rsi rsr rss sbb sbc sbe sbg sbi sbr sbs scb scc sce scg sci scr scs se- seb sec see seg sei ser ses sgb sgc sge sgg sgi sgr sgs sib sic sie sig sii sir sis sr- srb src sre srg sri srr srs ss- ssb ssc sse ssg ssi ssr sss