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