swirt wsirt siwrt iswrt wisrt iwsrt swrit wsrit srwit rswit wrsit rwsit sirwt isrwt sriwt rsiwt irswt riswt wirst iwrst wrist rwist irwst riwst switr wsitr siwtr iswtr wistr iwstr swtir wstir stwir tswir wtsir twsir sitwr istwr stiwr tsiwr itswr tiswr witsr iwtsr wtisr twisr itwsr tiwsr swrti wsrti srwti rswti wrsti rwsti swtri wstri stwri tswri wtsri twsri srtwi rstwi strwi tsrwi rtswi trswi wrtsi rwtsi wtrsi twrsi rtwsi trwsi sirtw isrtw sritw rsitw irstw ristw sitrw istrw stirw tsirw itsrw tisrw srtiw rstiw striw tsriw rtsiw trsiw irtsw ritsw itrsw tirsw rtisw trisw wirts iwrts writs rwits irwts riwts witrs iwtrs wtirs twirs itwrs tiwrs wrtis rwtis wtris twris rtwis trwis irtws ritws itrws tirws rtiws triws
Note: these 'words' (valid or invalid) are all the permutations of the word swirt. These words are obtained by scrambling the letters in swirt.