-er -th bbb bbe bbh bbo bbr bbs bbt bbx be- beb bee beh beo ber bes bet bex bhb bhe bhh bho bhr bhs bht bhx bob boe boh boo bor bos bot box brb bre brh bro brr brs brt brx bsb bse bsh bso bsr bss bst bsx btb bte bth bto btr bts btt btx bxb bxo bxx ebb ebe ebh ebo ebr ebs ebt ebx eeb eee eeo eer ees eet eex ehb ehe ehh eho ehr ehs eht eo- eob eoe eoh eoo eor eos eot erb ere erh ero err ers ert es- esb ese esh eso esr ess est esx etb ete eth eto etr ets ett etx ex- exe exh exo exr exs ext exx hbb hbe hbh hbo hbr hbs hbt hbx he- heb hee heh heo her hes het hex hhb hhe hhh hho hhr hhs hht hob hoe hoh hoo hor hos hot hox hr- hrb hre hrh hro hrr hrs hrt hsb hse hsh hsr hss hst hsx htb hte hth hto htr hts htt htx ob- obb obe obh obo obr obs obt obx oeb oee oeh oeo oer oes oet oex ohe ohh oho ohr ohs oht oo- oob ooh ooo oor oos oot oox or- orb ore orh oro orr ors ort orx os- osb ose osh oso osr oss ost osx ot- otb ote oth oto otr ots ott ox- oxb oxo oxt oxx rbb rbe rbh rbo rbr rbs rbt rbx re- reb ree reh reo rer res ret rex rh- rhb rhe rhh rho rhr rhs rht rob roe roh roo ror ros rot rox rrb rrh rrr rrs rrt rsb rse rsh rso rsr rss rst rsx rtb rte rto rtr rts rtt rtx rxr rxs sbb sbe sbh sbo sbr sbs sbt sbx se- seb see seh seo ser ses set sex sh- shb she shh sho shr shs sht sob soe soh soo sor sos sot sox sr- srb sre srh sro srr srs srt srx ss- ssb sse ssh sso ssr sss sst ssx stb ste sth sto str sts stt stx sxs sxt t-x tbb tbe tbh tbo tbr tbs tbt te- teb tee teh teo ter tes tet tex th- thb the thh tho thr ths tht thx to- tob toe toh too tor tos tot tox trb tre trh tro trr trs trt trx tsb tse tsh tso tsr tss tst tsx ttb tte tth tto ttr tts ttt ttx txe txs txt xbe xbr xbx xee xer xes xet xex xht xoo xor xos xot xox xrt xrx xsb xss xst xtr xts xtx xxo xxx