lsbin slbin lbsin blsin sblin bslin lsibn slibn lisbn ilsbn silbn islbn lbisn blisn libsn ilbsn bilsn iblsn sbiln bsiln sibln isbln bisln ibsln lsbni slbni lbsni blsni sblni bslni lsnbi slnbi lnsbi nlsbi snlbi nslbi lbnsi blnsi lnbsi nlbsi bnlsi nblsi sbnli bsnli snbli nsbli bnsli nbsli lsinb slinb lisnb ilsnb silnb islnb lsnib slnib lnsib nlsib snlib nslib linsb ilnsb lnisb nlisb inlsb nilsb sinlb isnlb snilb nsilb inslb nislb lbins blins libns ilbns bilns iblns lbnis blnis lnbis nlbis bnlis nblis linbs ilnbs lnibs nlibs inlbs nilbs binls ibnls bnils nbils inbls nibls sbinl bsinl sibnl isbnl bisnl ibsnl sbnil bsnil snbil nsbil bnsil nbsil sinbl isnbl snibl nsibl insbl nisbl binsl ibnsl bnisl nbisl inbsl nibsl
Note: these 'words' (valid or invalid) are all the permutations of the word lsbin. These words are obtained by scrambling the letters in lsbin.