-er ddd dde ddn ddo ddr ddt de- ded dee den deo der det dnd dne dnn dno dnr dnt dod doe don doo dor dot drd dre drn dro drr drt dtd dte dtn dto dtr dtt ed- edd ede edn edo edr edt eed eee een eeo eer eet 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 ndd nde ndn ndo ndr ndt ne- ned nee nen neo ner net nne nnn nno nnt no- nod noe non noo nor not nrd nre nrn nro nrr nrt ntd nte ntn nto ntr ntt odd ode odn odo odr odt oed oee oen oeo oer oet on- ond one onn ono onr ont oo- ood oon ooo oor oot or- ord ore orn oro orr ort ot- otd ote otn oto otr ott rdd rde rdn rdo rdr rdt re- red ree ren reo rer ret rnd rnn rno rnr rnt rod roe ron roo ror rot rrd rrn rrr rrt rtd rte rtn rto rtr rtt tdd tde tdn tdo tdr tdt te- ted tee ten teo ter tet tnd tne tnn tno tnr tnt to- tod toe ton too tor tot trd tre trn tro trr trt ttd tte ttn tto ttr ttt