-er ddd dde ddm ddr ddt ddx de- ded dee dem der det dex dmd dme dmm dmr dmt dmx drd dre drm drr drt drx dtd dte dtm dtr dtt dtx dxd dxr dxt dxx ed- edd ede edm edr edt edx eed eee eem eer eet eex em- emd eme emm emr emt emx erd ere erm err ert etd ete etm etr ett etx ex- exd exe exr ext exx m-r mdd mde mdm mdr mdt mdx med mee mem mer met mex mmd mme mmm mmr mmt mmx mrd mre mrm mrr mrt mrx mtd mte mtm mtr mtt mtx mxd mxr rdd rde rdm rdr rdt rdx re- red ree rem rer ret rex rmd rme rmm rmr rmt rmx rrd rrm rrr rrt rtd rte rtm rtr rtt rtx rxr t-x tdd tde tdm tdr tdt tdx te- ted tee tem ter tet tex tmd tme tmm tmr tmt tmx trd tre trm trr trt trx ttd tte ttm ttr ttt ttx txe txt xde xdm xdr xdt xed xee xem xer xet xex xmd xmm xmr xmt xmx xrd xrt xrx xtm xtr xtx xxx