swarf wsarf sawrf aswrf wasrf awsrf swraf wsraf srwaf rswaf wrsaf rwsaf sarwf asrwf srawf rsawf arswf raswf warsf awrsf wrasf rwasf arwsf rawsf swafr wsafr sawfr aswfr wasfr awsfr swfar wsfar sfwar fswar wfsar fwsar safwr asfwr sfawr fsawr afswr faswr wafsr awfsr wfasr fwasr afwsr fawsr swrfa wsrfa srwfa rswfa wrsfa rwsfa swfra wsfra sfwra fswra wfsra fwsra srfwa rsfwa sfrwa fsrwa rfswa frswa wrfsa rwfsa wfrsa fwrsa rfwsa frwsa sarfw asrfw srafw rsafw arsfw rasfw safrw asfrw sfarw fsarw afsrw fasrw srfaw rsfaw sfraw fsraw rfsaw frsaw arfsw rafsw afrsw farsw rfasw frasw warfs awrfs wrafs rwafs arwfs rawfs wafrs awfrs wfars fwars afwrs fawrs wrfas rwfas wfras fwras rfwas frwas arfws rafws afrws farws rfaws fraws
Note: these 'words' (valid or invalid) are all the permutations of the word swarf. These words are obtained by scrambling the letters in swarf.