rcyb cryb rycb yrcb cyrb ycrb rcby crby rbcy brcy cbry bcry rybc yrbc rbyc bryc ybrc byrc cybr ycbr cbyr bcyr ybcr bycr
Note: these 'words' (valid or invalid) are all the permutations of the word rcyb. These words are obtained by scrambling the letters in rcyb.