-er bbb bbe bbg bbi bbk bbl bbr bbs bbt be- beb bee beg bei bek bel ber bes bet bgb bge bgg bgi bgk bgl bgr bgs bgt bi- bib bie big bii bik bil bir bis bit bkb bke bkg bkk bkl bkr bks bkt blb ble blg bli blk bll blr bls blt brb bre brg bri brk brl brr brs brt bsb bse bsg bsi bsk bsl bsr bss bst btb bte btg bti btk btl btr bts btt ebb ebe ebg ebi ebk ebl ebr ebs ebt eeb eee eeg eek eel eer ees eet egb ege egg egi egl egr egs egt eib eie eig eii eik eil eir eis eit ekb eke ekg eki ekl ekr eks ekt elb ele elg eli elk ell elr els elt erb ere erg eri erk erl err ers ert es- esb ese esg esi esk esl esr ess est etb ete etg eti etk etl etr ets ett gbe gbg gbi gbk gbl gbr gbs gbt ge- geb gee geg gei gek gel ger ges get ggb ggg ggi ggr ggs ggt gib gie gig gii gik gil gir gis git gkb gks gkt glb gle glg gli glk gll glr gls glt grb gre grg gri grk grl grr grs grt gsb gse gsg gsi gsk gsl gsr gss gst gtb gte gtg gti gtk gtl gtr gts gtt ibb ibe ibg ibi ibk ibl ibr ibs ibt ie- iee ieg iei iek iel ier ies iet igb ige igg igi igk igl igr igs igt iib iie iii iil iir iis iit ikb ike iki ikk ikl ikr iks ikt il- ilb ile ilg ili ilk ill ilr ils ilt ir- irb ire irg iri irk irl irr irs irt is- isb ise isg isi isk isl isr iss ist itb ite itg iti itk itl its itt k-t kbb kbe kbi kbk kbl kbr kbs ke- keb kee keg kei kek kel ker kes ket kgb kgi kgl kgs kib kie kig kii kik kil kir kis kit kkb kke kki kkk kkl kkr kks kkt kl- klb klg kli klr kls klt krg kri krk krl krr krs krt ksb kse ksg ksi ksk ksl ksr kss kst ktb kte ktg ktk ktl ktr kts ktt lbb lbe lbg lbi lbk lbl lbr lbs lbt leb lee leg lei lek lel ler les let lgb lge lgg lgi lgk lgl lgr lgs lgt lib lie lig lii lik lil lir lis lit lkb lkg lkl lkr lks lkt llb lle llg lli llk lll llr lls llt lrb lrg lri lrk lrr lrs lrt lsb lse lsg lsi lsk lsl lsr lss lst ltb lte ltg lti ltk ltl ltr lts ltt rbb rbe rbg rbi rbk rbl rbr rbs rbt re- reb ree reg rei rek rel rer res ret rgb rge rgg rgi rgk rgr rgs rgt rib rie rig rii rik ril rir ris rit rkb rke rkg rkk rks rkt rle rlg rli rll rlr rls rlt rrb rrg rri rrk rrl rrr rrs rrt rsb rse rsg rsi rsk rsl rsr rss rst rtb rte rtg rti rtk rtl rtr rts rtt sbb sbe sbg sbi sbk sbl sbr sbs sbt se- seb see seg sei sek sel ser ses set sgb sge sgg sgi sgk sgl sgr sgs sgt sib sie sig sii sik sil sir sis sit sk- skb ske skg ski skk skl skr sks skt slb sle slg sli slk sll slr sls slt sr- srb sre srg sri srk srl srr srs srt ss- ssb sse ssg ssi ssk ssl ssr sss sst stb ste stg sti stk stl str sts stt tbb tbe tbg tbi tbk tbl tbr tbs tbt te- teb tee teg tei tek tel ter tes tet tgb tge tgg tgi tgk tgl tgr tgs tgt tib tie tig tii tik til tir tis tit tkb tke tkg tkk tkl tkr tks tkt tle tlg tli tlk tll tlr tls tlt trb tre trg tri trk trl trr trs trt tsb tse tsg tsi tsk tsl tsr tss tst ttb tte ttg tti ttk ttl ttr tts ttt