-er bbb bbe bbg bbi bbo bbr bbs bbt be- beb bee beg bei beo ber bes bet bgb bge bgg bgi bgo bgr bgs bgt bi- bib bie big bii bio bir bis bit bob boe bog boi boo bor bos bot brb bre brg bri bro brr brs brt bsb bse bsg bsi bso bsr bss bst btb bte btg bti bto btr bts btt ebb ebe ebg ebi ebo ebr ebs ebt eeb eee eeg eeo eer ees eet egb ege egg egi ego egr egs egt eib eie eig eii eio eir eis eit eo- eob eoe eog eoi eoo eor eos eot erb ere erg eri ero err ers ert es- esb ese esg esi eso esr ess est etb ete etg eti eto etr ets ett gbe gbg gbi gbo gbr gbs gbt ge- geb gee geg gei geo ger ges get ggb ggg ggi ggo ggr ggs ggt gib gie gig gii gio gir gis git gob goe gog goi goo gor gos got grb gre grg gri gro grr grs grt gsb gse gsg gsi gso gsr gss gst gtb gte gtg gti gto gtr gts gtt ibb ibe ibg ibi ibo ibr ibs ibt ie- iee ieg iei ier ies iet igb ige igg igi igo igr igs igt iib iie iii iio iir iis iit io- iob ioe iog ioi ioo ior ios iot ir- irb ire irg iri iro irr irs irt is- isb ise isg isi iso isr iss ist itb ite itg iti ito its itt o-i ob- obb obe obg obi obo obr obs obt oeb oee oeg oei oeo oer oes oet oge ogg ogi ogo ogs ogt oib oie oii oio oir ois oit oo- oob oog ooi ooo oor oos oot or- orb ore org ori oro orr ors ort os- osb ose osg osi oso osr oss ost ot- otb ote otg oti oto otr ots ott rbb rbe rbg rbi rbo rbr rbs rbt re- reb ree reg rei reo rer res ret rgb rge rgg rgi rgo rgr rgs rgt rib rie rig rii rio rir ris rit rob roe rog roi roo ror ros rot rrb rrg rri rrr rrs rrt rsb rse rsg rsi rso rsr rss rst rtb rte rtg rti rto rtr rts rtt sbb sbe sbg sbi sbo sbr sbs sbt se- seb see seg sei seo ser ses set sgb sge sgg sgi sgo sgr sgs sgt sib sie sig sii sio sir sis sit sob soe sog soi soo sor sos sot sr- srb sre srg sri sro srr srs srt ss- ssb sse ssg ssi sso ssr sss sst stb ste stg sti sto str sts stt tbb tbe tbg tbi tbo tbr tbs tbt te- teb tee teg tei teo ter tes tet tgb tge tgg tgi tgo tgr tgs tgt tib tie tig tii tio tir tis tit to- tob toe tog toi too tor tos tot trb tre trg tri tro trr trs trt tsb tse tsg tsi tso tsr tss tst ttb tte ttg tti tto ttr tts ttt