sleer lseer seler esler leser elser sleer lseer seler esler leser elser seelr eselr seelr eselr eeslr eeslr leesr elesr leesr elesr eelsr eelsr slere lsere selre eslre lesre elsre slree lsree srlee rslee lrsee rlsee serle esrle srele rsele ersle resle lerse elrse lrese rlese erlse relse slere lsere selre eslre lesre elsre slree lsree srlee rslee lrsee rlsee serle esrle srele rsele ersle resle lerse elrse lrese rlese erlse relse seerl eserl seerl eserl eesrl eesrl serel esrel sreel rseel ersel resel serel esrel sreel rseel ersel resel eersl eersl eresl reesl eresl reesl leers elers leers elers eelrs eelrs leres elres lrees rlees erles reles leres elres lrees rlees erles reles eerls eerls erels reels erels reels
Note: these 'words' (valid or invalid) are all the permutations of the word sleer. These words are obtained by scrambling the letters in sleer.