shill hsill sihll ishll hisll ihsll shlil hslil slhil lshil hlsil lhsil silhl islhl slihl lsihl ilshl lishl hilsl ihlsl hlisl lhisl ilhsl lihsl shill hsill sihll ishll hisll ihsll shlil hslil slhil lshil hlsil lhsil silhl islhl slihl lsihl ilshl lishl hilsl ihlsl hlisl lhisl ilhsl lihsl shlli hslli slhli lshli hlsli lhsli shlli hslli slhli lshli hlsli lhsli sllhi lslhi sllhi lslhi llshi llshi hllsi lhlsi hllsi lhlsi llhsi llhsi sillh isllh slilh lsilh ilslh lislh sillh isllh slilh lsilh ilslh lislh sllih lslih sllih lslih llsih llsih illsh lilsh illsh lilsh llish llish hills ihlls hlils lhils ilhls lihls hills ihlls hlils lhils ilhls lihls hllis lhlis hllis lhlis llhis llhis illhs lilhs illhs lilhs llihs llihs
Note: these 'words' (valid or invalid) are all the permutations of the word shill. These words are obtained by scrambling the letters in shill.