-er bbb bbe bbg bbi bbo bbr bbs be- beb bee beg bei beo ber bes bgb bge bgg bgi bgo bgr bgs bi- bib bie big bii bio bir bis bob boe bog boi boo bor bos brb bre brg bri bro brr brs bsb bse bsg bsi bso bsr bss ebb ebe ebg ebi ebo ebr ebs eeb eee eeg eeo eer ees egb ege egg egi ego egr egs eib eie eig eii eio eir eis eo- eob eoe eog eoi eoo eor eos erb ere erg eri ero err ers es- esb ese esg esi eso esr ess gbe gbg gbi gbo gbr gbs ge- geb gee geg gei geo ger ges ggb ggg ggi ggo ggr ggs gib gie gig gii gio gir gis gob goe gog goi goo gor gos grb gre grg gri gro grr grs gsb gse gsg gsi gso gsr gss ibb ibe ibg ibi ibo ibr ibs ie- iee ieg iei ier ies igb ige igg igi igo igr igs iib iie iii iio iir iis io- iob ioe iog ioi ioo ior ios ir- irb ire irg iri iro irr irs is- isb ise isg isi iso isr iss o-i ob- obb obe obg obi obo obr obs oeb oee oeg oei oeo oer oes oge ogg ogi ogo ogs oib oie oii oio oir ois oo- oob oog ooi ooo oor oos or- orb ore org ori oro orr ors os- osb ose osg osi oso osr oss rbb rbe rbg rbi rbo rbr rbs re- reb ree reg rei reo rer res rgb rge rgg rgi rgo rgr rgs rib rie rig rii rio rir ris rob roe rog roi roo ror ros rrb rrg rri rrr rrs rsb rse rsg rsi rso rsr rss sbb sbe sbg sbi sbo sbr sbs se- seb see seg sei seo ser ses sgb sge sgg sgi sgo sgr sgs sib sie sig sii sio sir sis sob soe sog soi soo sor sos sr- srb sre srg sri sro srr srs ss- ssb sse ssg ssi sso ssr sss