coofs ocofs coofs ocofs oocfs oocfs cofos ocfos cfoos fcoos ofcos focos cofos ocfos cfoos fcoos ofcos focos oofcs oofcs ofocs foocs ofocs foocs coosf ocosf coosf ocosf oocsf oocsf cosof ocsof csoof scoof oscof socof cosof ocsof csoof scoof oscof socof ooscf ooscf osocf soocf osocf soocf cofso ocfso cfoso fcoso ofcso focso cosfo ocsfo csofo scofo oscfo socfo cfsoo fcsoo csfoo scfoo fscoo sfcoo ofsco fosco osfco sofco fsoco sfoco cofso ocfso cfoso fcoso ofcso focso cosfo ocsfo csofo scofo oscfo socfo cfsoo fcsoo csfoo scfoo fscoo sfcoo ofsco fosco osfco sofco fsoco sfoco oofsc oofsc ofosc foosc ofosc foosc oosfc oosfc osofc soofc osofc soofc ofsoc fosoc osfoc sofoc fsooc sfooc ofsoc fosoc osfoc sofoc fsooc sfooc
Note: these 'words' (valid or invalid) are all the permutations of the word coofs. These words are obtained by scrambling the letters in coofs.