-er bbb bbe bbf bbg bbi bbl bbr bbs bbt be- beb bee bef beg bei bel ber bes bet bfb bfe bff bfg bfi bfl bfr bfs bft bgb bge bgf bgg bgi bgl bgr bgs bgt bi- bib bie bif big bii bil bir bis bit blb ble blf blg bli bll blr bls blt brb bre brf brg bri brl brr brs brt bsb bse bsf bsg bsi bsl bsr bss bst btb bte btf btg bti btl btr bts btt ebb ebe ebf ebg ebi ebl ebr ebs ebt eeb eee eef eeg eel eer ees eet ef- efb efe eff efg efi efl efr efs eft egb ege egf egg egi egl egr egs egt eib eie eif eig eii eil eir eis eit elb ele elf elg eli ell elr els elt erb ere erf erg eri erl err ers ert es- esb ese esf esg esi esl esr ess est etb ete etf etg eti etl etr ets ett fbb fbe fbf fbg fbi fbl fbr fbs fbt feb fee fef feg fei fel fer fes fet ffe fff ffg ffi ffl ffr ffs fft fgb fge fgf fgg fgi fgl fgr fgs fgt fib fie fif fig fii fil fir fis fit flb fle flf flg fli fll flr fls flt frb fre frf frg fri frl frr frs frt fsb fse fsf fsg fsi fsl fsr fss fst ftb fte ftf ftg fti ftl ftr fts ftt gbe gbf gbg gbi gbl gbr gbs gbt ge- geb gee gef geg gei gel ger ges get gfb gfe gff gfi gfl gfr gfs gft ggb ggg ggi ggr ggs ggt gib gie gif gig gii gil gir gis git glb gle glf glg gli gll glr gls glt grb gre grf grg gri grl grr grs grt gsb gse gsf gsg gsi gsl gsr gss gst gtb gte gtf gtg gti gtl gtr gts gtt i-f ibb ibe ibf ibg ibi ibl ibr ibs ibt ie- iee ief ieg iei iel ier ies iet ifb ife iff ifg ifi ifl ifr ifs ift igb ige igf igg igi igl igr igs igt iib iie iif iii iil iir iis iit il- ilb ile ilf ilg ili ill ilr ils ilt ir- irb ire irf irg iri irl irr irs irt is- isb ise isf isg isi isl isr iss ist itb ite itf itg iti itl its itt lbb lbe lbf lbg lbi lbl lbr lbs lbt leb lee lef leg lei lel ler les let lfb lfe lff lfg lfi lfl lfr lfs lft lgb lge lgf lgg lgi lgl lgr lgs lgt lib lie lif lig lii lil lir lis lit llb lle llf llg lli lll llr lls llt lrb lrf lrg lri lrr lrs lrt lsb lse lsf lsg lsi lsl lsr lss lst ltb lte ltf ltg lti ltl ltr lts ltt rbb rbe rbf rbg rbi rbl rbr rbs rbt re- reb ree ref reg rei rel rer res ret rfb rfe rff rfg rfi rfl rfr rfs rft rgb rge rgf rgg rgi rgr rgs rgt rib rie rif rig rii ril rir ris rit rle rlf rlg rli rll rlr rls rlt rrb rrf rrg rri rrl rrr rrs rrt rsb rse rsf rsg rsi rsl rsr rss rst rtb rte rtf rtg rti rtl rtr rts rtt sbb sbe sbf sbg sbi sbl sbr sbs sbt se- seb see sef seg sei sel ser ses set sfb sfe sff sfg sfi sfl sfr sfs sft sgb sge sgf sgg sgi sgl sgr sgs sgt sib sie sif sig sii sil sir sis sit slb sle slf slg sli sll slr sls slt sr- srb sre srf srg sri srl srr srs srt ss- ssb sse ssf ssg ssi ssl ssr sss sst stb ste stf stg sti stl str sts stt tbb tbe tbf tbg tbi tbl tbr tbs tbt te- teb tee tef teg tei tel ter tes tet tfb tfe tff tfg tfi tfl tfr tfs tft tgb tge tgf tgg tgi tgl tgr tgs tgt tib tie tif tig tii til tir tis tit tle tlf tlg tli tll tlr tls tlt trb tre trf trg tri trl trr trs trt tsb tse tsf tsg tsi tsl tsr tss tst ttb tte ttf ttg tti ttl ttr tts ttt