ddd dde ddm ddo ddx de- ded dee dem deo dex dmd dme dmm dmo dmx dod doe dom doo dox dxd dxo dxx ed- edd ede edm edo edx eed eee eem eeo eex em- emd eme emm emo emx eo- eod eoe eom eoo ex- exd exe exo exx m-o mdd mde mdm mdo mdx med mee mem meo mex mmd mme mmm mmo mmx mod moe mom moo mox mxd odd ode odm odo oed oee oem oeo oex om- omd ome omm omo omx oo- ood oom ooo oox ox- oxo oxx xde xdm xed xee xem xex xmd xmm xmo xmx xod xom xoo xox xxo xxx