yukos uykos ykuos kyuos ukyos kuyos yuoks uyoks youks oyuks uoyks ouyks ykous kyous yokus oykus koyus okyus ukoys kuoys uokys oukys kouys okuys yukso uykso ykuso kyuso ukyso kuyso yusko uysko ysuko syuko usyko suyko yksuo kysuo yskuo sykuo ksyuo skyuo uksyo kusyo uskyo sukyo ksuyo skuyo yuosk uyosk yousk oyusk uoysk ouysk yusok uysok ysuok syuok usyok suyok yosuk oysuk ysouk syouk osyuk soyuk uosyk ousyk usoyk suoyk osuyk souyk ykosu kyosu yoksu oyksu koysu okysu yksou kysou yskou sykou ksyou skyou yosku oysku ysoku syoku osyku soyku kosyu oksyu ksoyu skoyu oskyu sokyu ukosy kuosy uoksy ouksy kousy okusy uksoy kusoy uskoy sukoy ksuoy skuoy uosky ousky usoky suoky osuky souky kosuy oksuy ksouy skouy oskuy sokuy
Note: these 'words' (valid or invalid) are all the permutations of the word yukos. These words are obtained by scrambling the letters in yukos.