-er bbb bbe bbf bbg bbi bbr bbs bbt be- beb bee bef beg bei ber bes bet bfb bfe bff bfg bfi bfr bfs bft bgb bge bgf bgg bgi bgr bgs bgt bi- bib bie bif big bii bir bis bit brb bre brf brg bri brr brs brt bsb bse bsf bsg bsi bsr bss bst btb bte btf btg bti btr bts btt ebb ebe ebf ebg ebi ebr ebs ebt eeb eee eef eeg eer ees eet ef- efb efe eff efg efi efr efs eft egb ege egf egg egi egr egs egt eib eie eif eig eii eir eis eit erb ere erf erg eri err ers ert es- esb ese esf esg esi esr ess est etb ete etf etg eti etr ets ett fbb fbe fbf fbg fbi fbr fbs fbt feb fee fef feg fei fer fes fet ffe fff ffg ffi ffr ffs fft fgb fge fgf fgg fgi fgr fgs fgt fib fie fif fig fii fir fis fit frb fre frf frg fri frr frs frt fsb fse fsf fsg fsi fsr fss fst ftb fte ftf ftg fti ftr fts ftt gbe gbf gbg gbi gbr gbs gbt ge- geb gee gef geg gei ger ges get gfb gfe gff gfi gfr gfs gft ggb ggg ggi ggr ggs ggt gib gie gif gig gii gir gis git grb gre grf grg gri grr grs grt gsb gse gsf gsg gsi gsr gss gst gtb gte gtf gtg gti gtr gts gtt i-f ibb ibe ibf ibg ibi ibr ibs ibt ie- iee ief ieg iei ier ies iet ifb ife iff ifg ifi ifr ifs ift igb ige igf igg igi igr igs igt iib iie iif iii iir iis iit ir- irb ire irf irg iri irr irs irt is- isb ise isf isg isi isr iss ist itb ite itf itg iti its itt rbb rbe rbf rbg rbi rbr rbs rbt re- reb ree ref reg rei rer res ret rfb rfe rff rfg rfi rfr rfs rft rgb rge rgf rgg rgi rgr rgs rgt rib rie rif rig rii rir ris rit rrb rrf rrg rri rrr rrs rrt rsb rse rsf rsg rsi rsr rss rst rtb rte rtf rtg rti rtr rts rtt sbb sbe sbf sbg sbi sbr sbs sbt se- seb see sef seg sei ser ses set sfb sfe sff sfg sfi sfr sfs sft sgb sge sgf sgg sgi sgr sgs sgt sib sie sif sig sii sir sis sit sr- srb sre srf srg sri srr srs srt ss- ssb sse ssf ssg ssi ssr sss sst stb ste stf stg sti str sts stt tbb tbe tbf tbg tbi tbr tbs tbt te- teb tee tef teg tei ter tes tet tfb tfe tff tfg tfi tfr tfs tft tgb tge tgf tgg tgi tgr tgs tgt tib tie tif tig tii tir tis tit trb tre trf trg tri trr trs trt tsb tse tsf tsg tsi tsr tss tst ttb tte ttf ttg tti ttr tts ttt