ghcd hgcd gchd cghd hcgd chgd ghdc hgdc gdhc dghc hdgc dhgc gcdh cgdh gdch dgch cdgh dcgh hcdg chdg hdcg dhcg cdhg dchg
Note: these 'words' (valid or invalid) are all the permutations of the word ghcd. These words are obtained by scrambling the letters in ghcd.