nerka enrka nreka rneka ernka renka nekra enkra nkera knera eknra kenra nrkea rnkea nkrea knrea rknea krnea erkna rekna ekrna kerna rkena krena nerak enrak nreak rneak ernak renak neark enark naerk anerk eanrk aenrk nraek rnaek narek anrek ranek arnek erank reank earnk aernk raenk arenk nekar enkar nkear knear eknar kenar neakr enakr naekr anekr eankr aenkr nkaer knaer naker anker kaner akner ekanr keanr eaknr aeknr kaenr akenr nrkae rnkae nkrae knrae rknae krnae nrake rnake narke anrke ranke arnke nkare knare nakre ankre kanre aknre rkane krane rakne arkne karne akrne erkan rekan ekran keran rkean krean erakn reakn earkn aerkn raekn arekn ekarn kearn eakrn aekrn kaern akern rkaen kraen raken arken karen akren
Note: these 'words' (valid or invalid) are all the permutations of the word nerka. These words are obtained by scrambling the letters in nerka.