fetor eftor fteor tfeor etfor tefor feotr efotr foetr ofetr eoftr oeftr ftoer tfoer foter ofter tofer otfer etofr teofr eotfr oetfr toefr otefr fetro eftro ftero tfero etfro tefro ferto efrto freto rfeto erfto refto ftreo tfreo frteo rfteo trfeo rtfeo etrfo terfo ertfo retfo trefo rtefo feort efort foert ofert eofrt oefrt ferot efrot freot rfeot erfot refot foret ofret froet rfoet orfet rofet eorft oerft eroft reoft oreft roeft ftore tfore fotre oftre tofre otfre ftroe tfroe frtoe rftoe trfoe rtfoe forte ofrte frote rfote orfte rofte torfe otrfe trofe rtofe ortfe rotfe etorf teorf eotrf oetrf toerf oterf etrof terof ertof retof treof rteof eortf oertf erotf reotf oretf roetf toref otref troef rtoef ortef rotef
Note: these 'words' (valid or invalid) are all the permutations of the word fetor. These words are obtained by scrambling the letters in fetor.