toffs otffs tfofs ftofs oftfs fotfs toffs otffs tfofs ftofs oftfs fotfs tffos ftfos tffos ftfos fftos fftos offts fofts offts fofts ffots ffots tofsf otfsf tfosf ftosf oftsf fotsf tosff otsff tsoff stoff ostff sotff tfsof ftsof tsfof stfof fstof sftof ofstf fostf osftf softf fsotf sfotf tofsf otfsf tfosf ftosf oftsf fotsf tosff otsff tsoff stoff ostff sotff tfsof ftsof tsfof stfof fstof sftof ofstf fostf osftf softf fsotf sfotf tffso ftfso tffso ftfso fftso fftso tfsfo ftsfo tsffo stffo fstfo sftfo tfsfo ftsfo tsffo stffo fstfo sftfo ffsto ffsto fsfto sffto fsfto sffto offst fofst offst fofst ffost ffost ofsft fosft osfft sofft fsoft sfoft ofsft fosft osfft sofft fsoft sfoft ffsot ffsot fsfot sffot fsfot sffot
Note: these 'words' (valid or invalid) are all the permutations of the word toffs. These words are obtained by scrambling the letters in toffs.