-er -th bbb bbe bbh bbi bbo bbr bbs bbt bbx be- beb bee beh bei beo ber bes bet bex bhb bhe bhh bhi bho bhr bhs bht bhx bi- bib bie bih bii bio bir bis bit bix bob boe boh boi boo bor bos bot box brb bre brh bri bro brr brs brt brx bsb bse bsh bsi bso bsr bss bst bsx btb bte bth bti bto btr bts btt btx bxb bxi bxo bxx ebb ebe ebh ebi ebo ebr ebs ebt ebx eeb eee eeo eer ees eet eex ehb ehe ehh ehi eho ehr ehs eht eib eie eii eio eir eis eit eix eo- eob eoe eoh eoi eoo eor eos eot erb ere erh eri ero err ers ert es- esb ese esh esi eso esr ess est esx etb ete eth eti eto etr ets ett etx ex- exe exh exi exo exr exs ext exx h-i hbb hbe hbh hbi hbo hbr hbs hbt hbx he- heb hee heh hei heo her hes het hex hhb hhe hhh hhi hho hhr hhs hht hib hie hih hii hio hir his hit hix hob hoe hoh hoi hoo hor hos hot hox hr- hrb hre hrh hri hro hrr hrs hrt hsb hse hsh hsi hsr hss hst hsx htb hte hth hti hto htr hts htt htx ibb ibe ibh ibi ibo ibr ibs ibt ibx ie- iee iei ier ies iet iex ihb ihe ihh ihi iho ihr ihs iht iib iie iih iii iio iir iis iit iix io- iob ioe ioh ioi ioo ior ios iot ir- irb ire iri iro irr irs irt irx is- isb ise ish isi iso isr iss ist itb ite ith iti ito its itt itx ixe ixi o-i ob- obb obe obh obi obo obr obs obt obx oeb oee oeh oei oeo oer oes oet oex ohe ohh ohi oho ohr ohs oht oib oie oii oio oir ois oit oo- oob ooh ooi ooo oor oos oot oox or- orb ore orh ori oro orr ors ort orx os- osb ose osh osi oso osr oss ost osx ot- otb ote oth oti oto otr ots ott ox- oxb oxi oxo oxt oxx rbb rbe rbh rbi rbo rbr rbs rbt rbx re- reb ree reh rei reo rer res ret rex rh- rhb rhe rhh rhi rho rhr rhs rht rib rie rih rii rio rir ris rit rix rob roe roh roi roo ror ros rot rox rrb rrh rri rrr rrs rrt rsb rse rsh rsi rso rsr rss rst rsx rtb rte rti rto rtr rts rtt rtx rxr rxs sbb sbe sbh sbi sbo sbr sbs sbt sbx se- seb see seh sei seo ser ses set sex sh- shb she shh shi sho shr shs sht sib sie sih sii sio sir sis sit six sob soe soh soi soo sor sos sot sox sr- srb sre srh sri sro srr srs srt srx ss- ssb sse ssh ssi sso ssr sss sst ssx stb ste sth sti sto str sts stt stx sxi sxs sxt t-x tbb tbe tbh tbi tbo tbr tbs tbt te- teb tee teh tei teo ter tes tet tex th- thb the thh thi tho thr ths tht thx tib tie tih tii tio tir tis tit tix to- tob toe toh toi too tor tos tot tox trb tre trh tri tro trr trs trt trx tsb tse tsh tsi tso tsr tss tst tsx ttb tte tth tti tto ttr tts ttt ttx txe txi txs txt xbe xbr xbx xee xer xes xet xex xht xie xii xio xis xit xix xoi xoo xor xos xot xox xrt xrx xsb xsi xss xst xti xtr xts xtx xxi xxo xxx