tench etnch tnech ntech entch netch tecnh etcnh tcenh ctenh ectnh cetnh tnceh ntceh tcneh ctneh ncteh cnteh encth necth ecnth centh nceth cneth tenhc etnhc tnehc ntehc enthc nethc tehnc ethnc thenc htenc ehtnc hetnc tnhec nthec thnec htnec nhtec hntec enhtc nehtc ehntc hentc nhetc hnetc techn etchn tcehn ctehn ecthn cethn tehcn ethcn thecn htecn ehtcn hetcn tchen cthen thcen htcen chten hcten echtn cehtn ehctn hectn chetn hcetn tnche ntche tcnhe ctnhe ncthe cnthe tnhce nthce thnce htnce nhtce hntce tchne cthne thcne htcne chtne hctne nchte cnhte nhcte hncte chnte hcnte encht necht ecnht cenht nceht cneht enhct nehct ehnct henct nhect hnect echnt cehnt ehcnt hecnt chent hcent nchet cnhet nhcet hncet chnet hcnet
Note: these 'words' (valid or invalid) are all the permutations of the word tench. These words are obtained by scrambling the letters in tench.