-er -th ddd dde ddh ddo ddr dds ddt ddx de- ded dee deh deo der des det dex dh- dhd dhe dhh dho dhr dhs dht dod doe doh doo dor dos dot dox drd dre dro drr drs drt drx dsd dse dsh dso dsr dss dst dsx dtd dte dth dto dtr dts dtt dtx dxd dxo dxr dxs dxt dxx ed- edd ede edh edo edr eds edt edx eed eee eeo eer ees eet eex ehd ehe ehh eho ehr ehs eht eo- eod eoe eoh eoo eor eos eot erd ere erh ero err ers ert es- esd ese esh eso esr ess est esx etd ete eth eto etr ets ett etx ex- exd exe exh exo exr exs ext exx hdd hde hdh hdo hdr hds hdt hdx he- hed hee heh heo her hes het hex hhd hhe hhh hho hhr hhs hht hod hoe hoh hoo hor hos hot hox hr- hrd hre hrh hro hrr hrs hrt hsd hse hsh hsr hss hst hsx htd hte hth hto htr hts htt htx hxd odd ode odh odo odr ods odt oed oee oeh oeo oer oes oet oex ohd ohe ohh oho ohr ohs oht oo- ood ooh ooo oor oos oot oox or- ord ore orh oro orr ors ort orx os- osd ose osh oso osr oss ost osx ot- otd ote oth oto otr ots ott ox- oxo oxt oxx rdd rde rdh rdo rdr rds rdt rdx re- red ree reh reo rer res ret rex rh- rhd rhe rhh rho rhr rhs rht rod roe roh roo ror ros rot rox rrd rrh rrr rrs rrt rsd rse rsh rso rsr rss rst rsx rtd rte rto rtr rts rtt rtx rxr rxs sdd sde sdh sdo sdr sds sdt se- sed see seh seo ser ses set sex sh- shd she shh sho shr shs sht sod soe soh soo sor sos sot sox sr- srd sre srh sro srr srs srt srx ss- ssd sse ssh sso ssr sss sst ssx std ste sth sto str sts stt stx sxs sxt t-x tdd tde tdh tdo tdr tds tdt tdx te- ted tee teh teo ter tes tet tex th- thd the thh tho thr ths tht thx to- tod toe toh too tor tos tot tox trd tre trh tro trr trs trt trx tsd tse tsh tso tsr tss tst tsx ttd tte tth tto ttr tts ttt ttx txe txs txt xde xdh xdr xds xdt xed xee xer xes xet xex xhd xht xod xoo xor xos xot xox xrd xrt xrx xss xst xtr xts xtx xxo xxx