ncred cnred nrced rnced crned rcned ncerd cnerd necrd encrd cenrd ecnrd nrecd rnecd nercd enrcd rencd erncd crend rcend cernd ecrnd recnd ercnd ncrde cnrde nrcde rncde crnde rcnde ncdre cndre ndcre dncre cdnre dcnre nrdce rndce ndrce dnrce rdnce drnce crdne rcdne cdrne dcrne rdcne drcne ncedr cnedr necdr encdr cendr ecndr ncder cnder ndcer dncer cdner dcner nedcr endcr ndecr dnecr edncr dencr cednr ecdnr cdenr dcenr edcnr decnr nredc rnedc nerdc enrdc rendc erndc nrdec rndec ndrec dnrec rdnec drnec nedrc endrc nderc dnerc ednrc denrc rednc erdnc rdenc drenc edrnc dernc credn rcedn cerdn ecrdn recdn ercdn crden rcden cdren dcren rdcen drcen cedrn ecdrn cdern dcern edcrn decrn redcn erdcn rdecn drecn edrcn dercn
Note: these 'words' (valid or invalid) are all the permutations of the word ncred. These words are obtained by scrambling the letters in ncred.