-er ddd dde ddn ddp ddr ddt de- ded dee den dep der det dnd dne dnn dnp dnr dnt dpd dpe dpn dpp dpr dpt drd dre drn drp drr drt dtd dte dtn dtp dtr dtt ed- edd ede edn edp edr edt eed eee een eep eer eet en- end ene enn enp enr ent ep- epd epe epn epp epr ept erd ere ern erp err ert etd ete etn etp etr ett ndd nde ndn ndp ndr ndt ne- ned nee nen nep ner net nne nnn nnp nnt npd npe npn npp npr npt nrd nre nrn nrp nrr nrt ntd nte ntn ntp ntr ntt p-p pdd pde pdn pdp pdr pdt ped pee pen pep per pet pn- pnd pne pnn pnp pnr pnt ppd ppe ppn ppp ppr ppt prd pre prn prp prr prt pt- ptd pte ptn ptp ptr ptt rdd rde rdn rdp rdr rdt re- red ree ren rep rer ret rnd rnn rnp rnr rnt rpd rpe rpn rpp rpr rpt rrd rrn rrp rrr rrt rtd rte rtn rtp rtr rtt tdd tde tdn tdp tdr tdt te- ted tee ten tep ter tet tnd tne tnn tnp tnr tnt tpd tpe tpn tpp tpr tpt trd tre trn trp trr trt ttd tte ttn ttp ttr ttt