skpes kspes spkes pskes kpses pkses skeps kseps sekps eskps kesps eksps speks pseks sepks espks pesks epsks kpess pkess kepss ekpss pekss epkss skpse kspse spkse pskse kpsse pksse skspe ksspe sskpe sskpe ksspe skspe spske psske sspke sspke psske spske kpsse pksse kspse skpse pskse spkse skesp ksesp seksp esksp kessp ekssp sksep kssep sskep sskep kssep sksep seskp esskp ssekp ssekp esskp seskp kessp ekssp ksesp skesp esksp seksp spesk psesk sepsk espsk pessk epssk spsek pssek sspek sspek pssek spsek sespk esspk ssepk ssepk esspk sespk pessk epssk psesk spesk espsk sepsk kpess pkess kepss ekpss pekss epkss kpses pkses kspes skpes pskes spkes kesps eksps kseps skeps eskps sekps pesks epsks pseks speks espks sepks
Note: these 'words' (valid or invalid) are all the permutations of the word skpes. These words are obtained by scrambling the letters in skpes.