-er -th bbb bbe bbh bbi bbr bbs bbt bbx be- beb bee beh bei ber bes bet bex bhb bhe bhh bhi bhr bhs bht bhx bi- bib bie bih bii bir bis bit bix brb bre brh bri brr brs brt brx bsb bse bsh bsi bsr bss bst bsx btb bte bth bti btr bts btt btx bxb bxi bxx ebb ebe ebh ebi ebr ebs ebt ebx eeb eee eer ees eet eex ehb ehe ehh ehi ehr ehs eht eib eie eii eir eis eit eix erb ere erh eri err ers ert es- esb ese esh esi esr ess est esx etb ete eth eti etr ets ett etx ex- exe exh exi exr exs ext exx h-i hbb hbe hbh hbi hbr hbs hbt hbx he- heb hee heh hei her hes het hex hhb hhe hhh hhi hhr hhs hht hib hie hih hii hir his hit hix hr- hrb hre hrh hri hrr hrs hrt hsb hse hsh hsi hsr hss hst hsx htb hte hth hti htr hts htt htx ibb ibe ibh ibi ibr ibs ibt ibx ie- iee iei ier ies iet iex ihb ihe ihh ihi ihr ihs iht iib iie iih iii iir iis iit iix ir- irb ire iri irr irs irt irx is- isb ise ish isi isr iss ist itb ite ith iti its itt itx ixe ixi rbb rbe rbh rbi rbr rbs rbt rbx re- reb ree reh rei rer res ret rex rh- rhb rhe rhh rhi rhr rhs rht rib rie rih rii rir ris rit rix rrb rrh rri rrr rrs rrt rsb rse rsh rsi rsr rss rst rsx rtb rte rti rtr rts rtt rtx rxr rxs sbb sbe sbh sbi sbr sbs sbt sbx se- seb see seh sei ser ses set sex sh- shb she shh shi shr shs sht sib sie sih sii sir sis sit six sr- srb sre srh sri srr srs srt srx ss- ssb sse ssh ssi ssr sss sst ssx stb ste sth sti str sts stt stx sxi sxs sxt t-x tbb tbe tbh tbi tbr tbs tbt te- teb tee teh tei ter tes tet tex th- thb the thh thi thr ths tht thx tib tie tih tii tir tis tit tix trb tre trh tri trr trs trt trx tsb tse tsh tsi tsr tss tst tsx ttb tte tth tti ttr tts ttt ttx txe txi txs txt xbe xbr xbx xee xer xes xet xex xht xie xii xis xit xix xrt xrx xsb xsi xss xst xti xtr xts xtx xxi xxx