-er ddd dde ddi ddo ddp ddr ddt ddx de- ded dee dei deo dep der det dex di- did die dii dio dip dir dit dix dod doe doi doo dop dor dot dox dpd dpe dpi dpo dpp dpr dpt drd dre dri dro drp drr drt drx dtd dte dti dto dtp dtr dtt dtx dxd dxi dxo dxp dxr dxt dxx ed- edd ede edi edo edp edr edt edx eed eee eeo eep eer eet eex eid eie eii eio eip eir eit eix eo- eod eoe eoi eoo eop eor eot ep- epd epe epi epo epp epr ept epx erd ere eri ero erp err ert etd ete eti eto etp etr ett etx ex- exd exe exi exo exp exr ext exx i-d idd ide idi ido idp idr idt idx ie- ied iee iei iep ier iet iex iid iie iii iio iip iir iit iix io- iod ioe ioi ioo iop ior iot ipd ipe ipi ipo ipp ipr ipt ipx ir- ird ire iri iro irp irr irt irx itd ite iti ito itp itt itx ixe ixi o-i odd ode odi odo odp odr odt oed oee oei oeo oep oer oet oex oid oie oii oio oip oir oit oo- ood ooi ooo oop oor oot oox op- opd ope opi opo opp opr opt opx or- ord ore ori oro orp orr ort orx ot- otd ote oti oto otp otr ott ox- oxi oxo oxt oxx p-p pdd pde pdi pdo pdp pdr pdt pdx ped pee pei peo pep per pet pex pid pie pii pio pip pir pit pix pod poe poi poo pop por pot pox ppd ppe ppi ppo ppp ppr ppt ppx prd pre pri pro prp prr prt prx pt- ptd pte pti pto ptp ptr ptt ptx pxe pxr pxt rdd rde rdi rdo rdp rdr rdt rdx re- red ree rei reo rep rer ret rex rid rie rii rio rip rir rit rix rod roe roi roo rop ror rot rox rpd rpe rpi rpo rpp rpr rpt rpx rrd rri rrp rrr rrt rtd rte rti rto rtp rtr rtt rtx rxp rxr t-x tdd tde tdi tdo tdp tdr tdt tdx te- ted tee tei teo tep ter tet tex tid tie tii tio tip tir tit tix to- tod toe toi too top tor tot tox tpd tpe tpi tpo tpp tpr tpt tpx trd tre tri tro trp trr trt trx ttd tte tti tto ttp ttr ttt ttx txe txi txt xde xdi xdr xdt xed xee xep xer xet xex xie xii xio xit xix xod xoi xoo xop xor xot xox xpd xpe xpo xpp xpt xrd xrt xrx xti xtp xtr xtx xxi xxo xxp xxx