-er ddd dde ddm ddp ddr ddt ddx de- ded dee dem dep der det dex dmd dme dmm dmp dmr dmt dmx dpd dpe dpm dpp dpr dpt drd dre drm drp drr drt drx dtd dte dtm dtp dtr dtt dtx dxd dxp dxr dxt dxx ed- edd ede edm edp edr edt edx eed eee eem eep eer eet eex em- emd eme emm emp emr emt emx ep- epd epe epm epp epr ept epx erd ere erm erp err ert etd ete etm etp etr ett etx ex- exd exe exp exr ext exx m-r mdd mde mdm mdp mdr mdt mdx med mee mem mep mer met mex mmd mme mmm mmp mmr mmt mmx mpd mpe mpm mpp mpr mpt mpx mrd mre mrm mrp mrr mrt mrx mtd mte mtm mtp mtr mtt mtx mxd mxp mxr p-p pdd pde pdm pdp pdr pdt pdx ped pee pem pep per pet pex pmd pme pmm pmp pmr pmt pmx ppd ppe ppm ppp ppr ppt ppx prd pre prm prp prr prt prx pt- ptd pte ptm ptp ptr ptt ptx pxe pxm pxr pxt rdd rde rdm rdp rdr rdt rdx re- red ree rem rep rer ret rex rmd rme rmm rmp rmr rmt rmx rpd rpe rpm rpp rpr rpt rpx rrd rrm rrp rrr rrt rtd rte rtm rtp rtr rtt rtx rxp rxr t-x tdd tde tdm tdp tdr tdt tdx te- ted tee tem tep ter tet tex tmd tme tmm tmp tmr tmt tmx tpd tpe tpm tpp tpr tpt tpx trd tre trm trp trr trt trx ttd tte ttm ttp ttr ttt ttx txe txt xde xdm xdr xdt xed xee xem xep xer xet xex xmd xmm xmp xmr xmt xmx xpd xpe xpm xpp xpt xrd xrt xrx xtm xtp xtr xtx xxp xxx