pstel sptel ptsel tpsel stpel tspel psetl spetl pestl epstl septl esptl ptesl tpesl petsl eptsl tepsl etpsl stepl tsepl setpl estpl tespl etspl pstle sptle ptsle tpsle stple tsple pslte splte plste lpste slpte lspte ptlse tplse pltse lptse tlpse ltpse stlpe tslpe sltpe lstpe tlspe ltspe pselt spelt peslt epslt seplt esplt pslet splet plset lpset slpet lspet pelst eplst plest lpest elpst lepst selpt eslpt slept lsept elspt lespt ptels tpels petls eptls tepls etpls ptles tples pltes lptes tlpes ltpes pelts eplts plets lpets elpts lepts telps etlps tleps lteps eltps letps stelp tselp setlp estlp teslp etslp stlep tslep sltep lstep tlsep ltsep seltp esltp sletp lsetp elstp lestp telsp etlsp tlesp ltesp eltsp letsp
Note: these 'words' (valid or invalid) are all the permutations of the word pstel. These words are obtained by scrambling the letters in pstel.