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