-er bbb bbe bbg bbi bbr bbs be- beb bee beg bei ber bes bgb bge bgg bgi bgr bgs bi- bib bie big bii bir bis brb bre brg bri brr brs bsb bse bsg bsi bsr bss ebb ebe ebg ebi ebr ebs eeb eee eeg eer ees egb ege egg egi egr egs eib eie eig eii eir eis erb ere erg eri err ers es- esb ese esg esi esr ess gbe gbg gbi gbr gbs ge- geb gee geg gei ger ges ggb ggg ggi ggr ggs gib gie gig gii gir gis grb gre grg gri grr grs gsb gse gsg gsi gsr gss ibb ibe ibg ibi ibr ibs ie- iee ieg iei ier ies igb ige igg igi igr igs iib iie iii iir iis ir- irb ire irg iri irr irs is- isb ise isg isi isr iss rbb rbe rbg rbi rbr rbs re- reb ree reg rei rer res rgb rge rgg rgi rgr rgs rib rie rig rii rir ris rrb rrg rri rrr rrs rsb rse rsg rsi rsr rss sbb sbe sbg sbi sbr sbs se- seb see seg sei ser ses sgb sge sgg sgi sgr sgs sib sie sig sii sir sis sr- srb sre srg sri srr srs ss- ssb sse ssg ssi ssr sss