-er ddd dde ddh ddn ddo ddr ddx de- ded dee deh den deo der dex dh- dhd dhe dhh dho dhr dnd dne dnh dnn dno dnr dod doe doh don doo dor dox drd dre drn dro drr drx dxd dxn dxo dxr dxx ed- edd ede edh edn edo edr edx eed eee een eeo eer eex ehd ehe ehh ehn eho ehr en- end ene enh enn eno enr eo- eod eoe eoh eon eoo eor erd ere erh ern ero err ex- exd exe exh exo exr exx hdd hde hdh hdn hdo hdr hdx he- hed hee heh hen heo her hex hhd hhe hhh hhn hho hhr hnd hne hnh hnn hno hod hoe hoh hon hoo hor hox hr- hrd hre hrh hrn hro hrr hxd ndd nde ndh ndn ndo ndr ne- ned nee neh nen neo ner nex nhd nhe nhh nhn nhr nne nnh nnn nno no- nod noe noh non noo nor nox nrd nre nrn nro nrr nrx nxd odd ode odh odn odo odr oed oee oeh oen oeo oer oex ohd ohe ohh ohn oho ohr on- ond one onh onn ono onr onx oo- ood ooh oon ooo oor oox or- ord ore orh orn oro orr orx ox- oxn oxo oxx rdd rde rdh rdn rdo rdr rdx re- red ree reh ren reo rer rex rh- rhd rhe rhh rhn rho rhr rnd rnh rnn rno rnr rod roe roh ron roo ror rox rrd rrh rrn rrr rxr xde xdh xdr xed xee xen xer xex xhd xno xod xon xoo xor xox xrd xrx xxo xxx