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