-er ddd dde ddh ddo ddr dds ddx de- ded dee deh deo der des dex dh- dhd dhe dhh dho dhr dhs dod doe doh doo dor dos dox drd dre dro drr drs drx dsd dse dsh dso dsr dss dsx dxd dxo dxr dxs dxx ed- edd ede edh edo edr eds edx eed eee eeo eer ees eex ehd ehe ehh eho ehr ehs eo- eod eoe eoh eoo eor eos erd ere erh ero err ers es- esd ese esh eso esr ess esx ex- exd exe exh exo exr exs exx hdd hde hdh hdo hdr hds hdx he- hed hee heh heo her hes hex hhd hhe hhh hho hhr hhs hod hoe hoh hoo hor hos hox hr- hrd hre hrh hro hrr hrs hsd hse hsh hsr hss hsx hxd odd ode odh odo odr ods oed oee oeh oeo oer oes oex ohd ohe ohh oho ohr ohs oo- ood ooh ooo oor oos oox or- ord ore orh oro orr ors orx os- osd ose osh oso osr oss osx ox- oxo oxx rdd rde rdh rdo rdr rds rdx re- red ree reh reo rer res rex rh- rhd rhe rhh rho rhr rhs rod roe roh roo ror ros rox rrd rrh rrr rrs rsd rse rsh rso rsr rss rsx rxr rxs sdd sde sdh sdo sdr sds se- sed see seh seo ser ses sex sh- shd she shh sho shr shs sod soe soh soo sor sos sox sr- srd sre srh sro srr srs srx ss- ssd sse ssh sso ssr sss ssx sxs xde xdh xdr xds xed xee xer xes xex xhd xod xoo xor xos xox xrd xrx xss xxo xxx