-er ddd dde ddn ddo ddr ddt ddx de- ded dee den deo der det dex dnd dne dnn dno dnr dnt dod doe don doo dor dot dox drd dre drn dro drr drt drx dtd dte dtn dto dtr dtt dtx dxd dxn dxo dxr dxt dxx ed- edd ede edn edo edr edt edx eed eee een eeo eer eet eex en- end ene enn eno enr ent eo- eod eoe eon eoo eor eot erd ere ern ero err ert etd ete etn eto etr ett etx ex- exd exe exo exr ext exx ndd nde ndn ndo ndr ndt ne- ned nee nen neo ner net nex nne nnn nno nnt no- nod noe non noo nor not nox nrd nre nrn nro nrr nrt nrx ntd nte ntn nto ntr ntt ntx nxd nxt odd ode odn odo odr odt oed oee oen oeo oer oet oex on- ond one onn ono onr ont onx oo- ood oon ooo oor oot oox or- ord ore orn oro orr ort orx ot- otd ote otn oto otr ott ox- oxn oxo oxt oxx rdd rde rdn rdo rdr rdt rdx re- red ree ren reo rer ret rex rnd rnn rno rnr rnt rod roe ron roo ror rot rox rrd rrn rrr rrt rtd rte rtn rto rtr rtt rtx rxr t-x tdd tde tdn tdo tdr tdt tdx te- ted tee ten teo ter tet tex tnd tne tnn tno tnr tnt tnx to- tod toe ton too tor tot tox trd tre trn tro trr trt trx ttd tte ttn tto ttr ttt ttx txe txn txt xde xdr xdt xed xee xen xer xet xex xno xod xon xoo xor xot xox xrd xrt xrx xtr xtx xxo xxx