trflo rtflo tfrlo ftrlo rftlo frtlo trlfo rtlfo tlrfo ltrfo rltfo lrtfo tflro ftlro tlfro ltfro fltro lftro rflto frlto rlfto lrfto flrto lfrto trfol rtfol tfrol ftrol rftol frtol trofl rtofl torfl otrfl rotfl ortfl tforl ftorl tofrl otfrl fotrl oftrl rfotl frotl roftl orftl fortl ofrtl trlof rtlof tlrof ltrof rltof lrtof trolf rtolf torlf otrlf rotlf ortlf tlorf ltorf tolrf otlrf lotrf oltrf rlotf lrotf roltf orltf lortf olrtf tflor ftlor tlfor ltfor fltor lftor tfolr ftolr toflr otflr fotlr oftlr tlofr ltofr tolfr otlfr lotfr oltfr flotr lfotr foltr ofltr loftr olftr rflot frlot rlfot lrfot flrot lfrot rfolt frolt roflt orflt forlt ofrlt rloft lroft rolft orlft lorft olrft flort lfort folrt oflrt lofrt olfrt
Note: these 'words' (valid or invalid) are all the permutations of the word trflo. These words are obtained by scrambling the letters in trflo.