derny edrny dreny rdeny erdny redny denry ednry dnery ndery endry nedry drney rdney dnrey ndrey rndey nrdey erndy rendy enrdy nerdy rnedy nredy deryn edryn dreyn rdeyn erdyn redyn deyrn edyrn dyern ydern eydrn yedrn dryen rdyen dyren ydren ryden yrden erydn reydn eyrdn yerdn ryedn yredn denyr ednyr dneyr ndeyr endyr nedyr deynr edynr dyenr ydenr eydnr yednr dnyer ndyer dyner ydner nyder ynder enydr neydr eyndr yendr nyedr ynedr drnye rdnye dnrye ndrye rndye nrdye dryne rdyne dyrne ydrne rydne yrdne dnyre ndyre dynre ydnre nydre yndre rnyde nryde rynde yrnde nyrde ynrde ernyd renyd enryd neryd rneyd nreyd erynd reynd eyrnd yernd ryend yrend enyrd neyrd eynrd yenrd nyerd ynerd rnyed nryed ryned yrned nyred ynred
Note: these 'words' (valid or invalid) are all the permutations of the word derny. These words are obtained by scrambling the letters in derny.