rolbl orlbl rlobl lrobl olrbl lorbl robll orbll rboll broll obrll borll rlbol lrbol rblol brlol lbrol blrol olbrl lobrl oblrl bolrl lborl blorl rollb orllb rlolb lrolb olrlb lorlb rollb orllb rlolb lrolb olrlb lorlb rllob lrlob rllob lrlob llrob llrob ollrb lolrb ollrb lolrb llorb llorb robll orbll rboll broll obrll borll rolbl orlbl rlobl lrobl olrbl lorbl rblol brlol rlbol lrbol blrol lbrol oblrl bolrl olbrl lobrl blorl lborl rlblo lrblo rbllo brllo lbrlo blrlo rllbo lrlbo rllbo lrlbo llrbo llrbo rbllo brllo rlblo lrblo blrlo lbrlo lblro bllro llbro llbro bllro lblro olblr loblr obllr bollr lbolr blolr ollbr lolbr ollbr lolbr llobr llobr obllr bollr olblr loblr blolr lbolr lblor bllor llbor llbor bllor lblor
Note: these 'words' (valid or invalid) are all the permutations of the word rolbl. These words are obtained by scrambling the letters in rolbl.