aspen sapen apsen pasen spaen psaen asepn saepn aespn easpn seapn esapn apesn paesn aepsn eapsn peasn epasn spean psean sepan espan pesan epsan aspne sapne apsne pasne spane psane asnpe sanpe anspe naspe snape nsape apnse panse anpse napse pnase npase spnae psnae snpae nspae pnsae npsae asenp saenp aesnp easnp seanp esanp asnep sanep ansep nasep snaep nsaep aensp eansp anesp naesp enasp neasp senap esnap sneap nseap ensap nesap apens paens aepns eapns peans epans apnes panes anpes napes pnaes npaes aenps eanps aneps naeps enaps neaps penas epnas pneas npeas enpas nepas spena psena sepna espna pesna epsna spnea psnea snpea nspea pnsea npsea senpa esnpa snepa nsepa enspa nespa pensa epnsa pnesa npesa enpsa nepsa
Note: these 'words' (valid or invalid) are all the permutations of the word aspen. These words are obtained by scrambling the letters in aspen.