-er bbb bbe bbg bbi bbl bbr bbs bbt be- beb bee beg bei bel ber bes bet bgb bge bgg bgi bgl bgr bgs bgt bi- bib bie big bii bil bir bis bit blb ble blg bli bll blr bls blt brb bre brg bri brl brr brs brt bsb bse bsg bsi bsl bsr bss bst btb bte btg bti btl btr bts btt ebb ebe ebg ebi ebl ebr ebs ebt eeb eee eeg eel eer ees eet egb ege egg egi egl egr egs egt eib eie eig eii eil eir eis eit elb ele elg eli ell elr els elt erb ere erg eri erl err ers ert es- esb ese esg esi esl esr ess est etb ete etg eti etl etr ets ett gbe gbg gbi gbl gbr gbs gbt ge- geb gee geg gei gel ger ges get ggb ggg ggi ggr ggs ggt gib gie gig gii gil gir gis git glb gle glg gli gll glr gls glt grb gre grg gri grl grr grs grt gsb gse gsg gsi gsl gsr gss gst gtb gte gtg gti gtl gtr gts gtt ibb ibe ibg ibi ibl ibr ibs ibt ie- iee ieg iei iel ier ies iet igb ige igg igi igl igr igs igt iib iie iii iil iir iis iit il- ilb ile ilg ili ill ilr ils ilt ir- irb ire irg iri irl irr irs irt is- isb ise isg isi isl isr iss ist itb ite itg iti itl its itt lbb lbe lbg lbi lbl lbr lbs lbt leb lee leg lei lel ler les let lgb lge lgg lgi lgl lgr lgs lgt lib lie lig lii lil lir lis lit llb lle llg lli lll llr lls llt lrb lrg lri lrr lrs lrt lsb lse lsg lsi lsl lsr lss lst ltb lte ltg lti ltl ltr lts ltt rbb rbe rbg rbi rbl rbr rbs rbt re- reb ree reg rei rel rer res ret rgb rge rgg rgi rgr rgs rgt rib rie rig rii ril rir ris rit rle rlg rli rll rlr rls rlt rrb rrg rri rrl rrr rrs rrt rsb rse rsg rsi rsl rsr rss rst rtb rte rtg rti rtl rtr rts rtt sbb sbe sbg sbi sbl sbr sbs sbt se- seb see seg sei sel ser ses set sgb sge sgg sgi sgl sgr sgs sgt sib sie sig sii sil sir sis sit slb sle slg sli sll slr sls slt sr- srb sre srg sri srl srr srs srt ss- ssb sse ssg ssi ssl ssr sss sst stb ste stg sti stl str sts stt tbb tbe tbg tbi tbl tbr tbs tbt te- teb tee teg tei tel ter tes tet tgb tge tgg tgi tgl tgr tgs tgt tib tie tig tii til tir tis tit tle tlg tli tll tlr tls tlt trb tre trg tri trl trr trs trt tsb tse tsg tsi tsl tsr tss tst ttb tte ttg tti ttl ttr tts ttt