netts entts ntets tnets etnts tents netts entts ntets tnets etnts tents nttes tntes nttes tntes ttnes ttnes ettns tetns ettns tetns ttens ttens netst entst ntest tnest etnst tenst nestt enstt nsett snett esntt sentt ntset tnset nstet sntet tsnet stnet etsnt tesnt estnt setnt tsent stent netst entst ntest tnest etnst tenst nestt enstt nsett snett esntt sentt ntset tnset nstet sntet tsnet stnet etsnt tesnt estnt setnt tsent stent nttse tntse nttse tntse ttnse ttnse ntste tnste nstte sntte tsnte stnte ntste tnste nstte sntte tsnte stnte ttsne ttsne tstne sttne tstne sttne ettsn tetsn ettsn tetsn ttesn ttesn etstn testn esttn settn tsetn stetn etstn testn esttn settn tsetn stetn ttsen ttsen tsten stten tsten stten
Note: these 'words' (valid or invalid) are all the permutations of the word netts. These words are obtained by scrambling the letters in netts.