luces ulces lcues clues ucles cules luecs ulecs leucs elucs uelcs eulcs lceus cleus lecus elcus celus eclus ucels cuels uecls eucls ceuls eculs lucse ulcse lcuse cluse uclse culse lusce ulsce lsuce sluce uslce sulce lcsue clsue lscue slcue cslue sclue ucsle cusle uscle sucle csule scule luesc ulesc leusc elusc uelsc eulsc lusec ulsec lsuec sluec uslec sulec lesuc elsuc lseuc sleuc esluc seluc ueslc euslc uselc suelc esulc seulc lcesu clesu lecsu elcsu celsu eclsu lcseu clseu lsceu slceu csleu scleu lescu elscu lsecu slecu eslcu selcu ceslu ecslu cselu scelu esclu seclu ucesl cuesl uecsl eucsl ceusl ecusl ucsel cusel uscel sucel csuel scuel uescl euscl usecl suecl esucl seucl cesul ecsul cseul sceul escul secul
Note: these 'words' (valid or invalid) are all the permutations of the word luces. These words are obtained by scrambling the letters in luces.