-er ddd dde ddn ddo ddp ddr ddt ddx de- ded dee den deo dep der det dex dnd dne dnn dno dnp dnr dnt dod doe don doo dop dor dot dox dpd dpe dpn dpo dpp dpr dpt drd dre drn dro drp drr drt drx dtd dte dtn dto dtp dtr dtt dtx dxd dxn dxo dxp dxr dxt dxx ed- edd ede edn edo edp edr edt edx eed eee een eeo eep eer eet eex en- end ene enn eno enp enr ent eo- eod eoe eon eoo eop eor eot ep- epd epe epn epo epp epr ept epx erd ere ern ero erp err ert etd ete etn eto etp etr ett etx ex- exd exe exo exp exr ext exx ndd nde ndn ndo ndp ndr ndt ne- ned nee nen neo nep ner net nex nne nnn nno nnp nnt no- nod noe non noo nop nor not nox npd npe npn npo npp npr npt nrd nre nrn nro nrp nrr nrt nrx ntd nte ntn nto ntp ntr ntt ntx nxd nxt odd ode odn odo odp odr odt oed oee oen oeo oep oer oet oex on- ond one onn ono onp onr ont onx oo- ood oon ooo oop oor oot oox op- opd ope opn opo opp opr opt opx or- ord ore orn oro orp orr ort orx ot- otd ote otn oto otp otr ott ox- oxn oxo oxt oxx p-p pdd pde pdn pdo pdp pdr pdt pdx ped pee pen peo pep per pet pex pn- pnd pne pnn pno pnp pnr pnt pnx pod poe pon poo pop por pot pox ppd ppe ppn ppo ppp ppr ppt ppx prd pre prn pro prp prr prt prx pt- ptd pte ptn pto ptp ptr ptt ptx pxe pxr pxt rdd rde rdn rdo rdp rdr rdt rdx re- red ree ren reo rep rer ret rex rnd rnn rno rnp rnr rnt rod roe ron roo rop ror rot rox rpd rpe rpn rpo rpp rpr rpt rpx rrd rrn rrp rrr rrt rtd rte rtn rto rtp rtr rtt rtx rxp rxr t-x tdd tde tdn tdo tdp tdr tdt tdx te- ted tee ten teo tep ter tet tex tnd tne tnn tno tnp tnr tnt tnx to- tod toe ton too top tor tot tox tpd tpe tpn tpo tpp tpr tpt tpx trd tre trn tro trp trr trt trx ttd tte ttn tto ttp ttr ttt ttx txe txn txt xde xdr xdt xed xee xen xep xer xet xex xno xod xon xoo xop xor xot xox xpd xpe xpn xpo xpp xpt xrd xrt xrx xtp xtr xtx xxo xxp xxx