-er ddd dde ddh ddo ddr de- ded dee deh deo der dh- dhd dhe dhh dho dhr dod doe doh doo dor drd dre dro drr ed- edd ede edh edo edr eed eee eeo eer ehd ehe ehh eho ehr eo- eod eoe eoh eoo eor erd ere erh ero err hdd hde hdh hdo hdr he- hed hee heh heo her hhd hhe hhh hho hhr hod hoe hoh hoo hor hr- hrd hre hrh hro hrr odd ode odh odo odr oed oee oeh oeo oer ohd ohe ohh oho ohr oo- ood ooh ooo oor or- ord ore orh oro orr rdd rde rdh rdo rdr re- red ree reh reo rer rh- rhd rhe rhh rho rhr rod roe roh roo ror rrd rrh rrr