-ene dddd ddre dedd dede deed deen deer dene denn der- dere dern derr dex- dexe dner dred dree dren dxdr dxed dxnd dxrd dxre dxrr dxrx dxxr dxxx edde ede- eden eder edex edrn eede eeee eend end- ende ened enee ener enne er-x erde ered eren erer erne erre exed exen exer exrx ndde nder ndre nedd nede need neen neer nend nene nerd nere nerr nexe nexx nnnn nren nrrd nxdn rder redd rede redr redx reed reen rend rene renn rerd rere rexx rred rrrr x-ed xeer xen- xene xenn xer- xexe xnee xxxx