nexts enxts nxets xnets exnts xents netxs entxs ntexs tnexs etnxs tenxs nxtes xntes ntxes tnxes xtnes txnes extns xetns etxns texns xtens txens nexst enxst nxest xnest exnst xenst nesxt ensxt nsext snext esnxt senxt nxset xnset nsxet snxet xsnet sxnet exsnt xesnt esxnt sexnt xsent sxent netsx entsx ntesx tnesx etnsx tensx nestx enstx nsetx snetx esntx sentx ntsex tnsex nstex sntex tsnex stnex etsnx tesnx estnx setnx tsenx stenx nxtse xntse ntxse tnxse xtnse txnse nxste xnste nsxte snxte xsnte sxnte ntsxe tnsxe nstxe sntxe tsnxe stnxe xtsne txsne xstne sxtne tsxne stxne extsn xetsn etxsn texsn xtesn txesn exstn xestn esxtn sextn xsetn sxetn etsxn tesxn estxn setxn tsexn stexn xtsen txsen xsten sxten tsxen stxen
Note: these 'words' (valid or invalid) are all the permutations of the word nexts. These words are obtained by scrambling the letters in nexts.