filos iflos flios lfios ilfos lifos fiols ifols foils ofils iofls oifls flois lfois folis oflis lofis olfis ilofs liofs iolfs oilfs loifs olifs filso iflso fliso lfiso ilfso lifso fislo ifslo fsilo sfilo isflo siflo flsio lfsio fslio sflio lsfio slfio ilsfo lisfo islfo silfo lsifo slifo fiosl ifosl foisl ofisl iofsl oifsl fisol ifsol fsiol sfiol isfol sifol fosil ofsil fsoil sfoil osfil sofil iosfl oisfl isofl siofl osifl soifl flosi lfosi folsi oflsi lofsi olfsi flsoi lfsoi fsloi sfloi lsfoi slfoi fosli ofsli fsoli sfoli osfli sofli losfi olsfi lsofi slofi oslfi solfi ilosf liosf iolsf oilsf loisf olisf ilsof lisof islof silof lsiof sliof ioslf oislf isolf siolf osilf soilf losif olsif lsoif sloif oslif solif
Note: these 'words' (valid or invalid) are all the permutations of the word filos. These words are obtained by scrambling the letters in filos.