-er bbb bbe bbg bbi bbr bbs bbt be- beb bee beg bei ber bes bet bgb bge bgg bgi bgr bgs bgt bi- bib bie big bii bir bis bit brb bre brg bri brr brs brt bsb bse bsg bsi bsr bss bst btb bte btg bti btr bts btt ebb ebe ebg ebi ebr ebs ebt eeb eee eeg eer ees eet egb ege egg egi egr egs egt eib eie eig eii eir eis eit erb ere erg eri err ers ert es- esb ese esg esi esr ess est etb ete etg eti etr ets ett gbe gbg gbi gbr gbs gbt ge- geb gee geg gei ger ges get ggb ggg ggi ggr ggs ggt gib gie gig gii gir gis git grb gre grg gri grr grs grt gsb gse gsg gsi gsr gss gst gtb gte gtg gti gtr gts gtt ibb ibe ibg ibi ibr ibs ibt ie- iee ieg iei ier ies iet igb ige igg igi igr igs igt iib iie iii iir iis iit ir- irb ire irg iri irr irs irt is- isb ise isg isi isr iss ist itb ite itg iti its itt rbb rbe rbg rbi rbr rbs rbt re- reb ree reg rei rer res ret rgb rge rgg rgi rgr rgs rgt rib rie rig rii rir ris rit rrb rrg rri rrr rrs rrt rsb rse rsg rsi rsr rss rst rtb rte rtg rti rtr rts rtt sbb sbe sbg sbi sbr sbs sbt se- seb see seg sei ser ses set sgb sge sgg sgi sgr sgs sgt sib sie sig sii sir sis sit sr- srb sre srg sri srr srs srt ss- ssb sse ssg ssi ssr sss sst stb ste stg sti str sts stt tbb tbe tbg tbi tbr tbs tbt te- teb tee teg tei ter tes tet tgb tge tgg tgi tgr tgs tgt tib tie tig tii tir tis tit trb tre trg tri trr trs trt tsb tse tsg tsi tsr tss tst ttb tte ttg tti ttr tts ttt