ndsba dnsba nsdba sndba dsnba sdnba ndbsa dnbsa nbdsa bndsa dbnsa bdnsa nsbda snbda nbsda bnsda sbnda bsnda dsbna sdbna dbsna bdsna sbdna bsdna ndsab dnsab nsdab sndab dsnab sdnab ndasb dnasb nadsb andsb dansb adnsb nsadb snadb nasdb ansdb sandb asndb dsanb sdanb dasnb adsnb sadnb asdnb ndbas dnbas nbdas bndas dbnas bdnas ndabs dnabs nadbs andbs danbs adnbs nbads bnads nabds anbds bands abnds dbans bdans dabns adbns badns abdns nsbad snbad nbsad bnsad sbnad bsnad nsabd snabd nasbd ansbd sanbd asnbd nbasd bnasd nabsd anbsd bansd abnsd sband bsand sabnd asbnd basnd absnd dsban sdban dbsan bdsan sbdan bsdan dsabn sdabn dasbn adsbn sadbn asdbn dbasn bdasn dabsn adbsn badsn abdsn sbadn bsadn sabdn asbdn basdn absdn
Note: these 'words' (valid or invalid) are all the permutations of the word ndsba. These words are obtained by scrambling the letters in ndsba.