proll rpoll porll oprll ropll orpll prlol rplol plrol lprol rlpol lrpol polrl oplrl plorl lporl olprl loprl rolpl orlpl rlopl lropl olrpl lorpl proll rpoll porll oprll ropll orpll prlol rplol plrol lprol rlpol lrpol polrl oplrl plorl lporl olprl loprl rolpl orlpl rlopl lropl olrpl lorpl prllo rpllo plrlo lprlo rlplo lrplo prllo rpllo plrlo lprlo rlplo lrplo pllro lplro pllro lplro llpro llpro rllpo lrlpo rllpo lrlpo llrpo llrpo pollr opllr plolr lpolr olplr loplr pollr opllr plolr lpolr olplr loplr pllor lplor pllor lplor llpor llpor ollpr lolpr ollpr lolpr llopr llopr rollp orllp rlolp lrolp olrlp lorlp rollp orllp rlolp lrolp olrlp lorlp rllop lrlop rllop lrlop llrop llrop ollrp lolrp ollrp lolrp llorp llorp
Note: these 'words' (valid or invalid) are all the permutations of the word proll. These words are obtained by scrambling the letters in proll.