bocks obcks bcoks cboks ocbks cobks bokcs obkcs bkocs kbocs okbcs kobcs bckos cbkos bkcos kbcos ckbos kcbos ockbs cokbs okcbs kocbs ckobs kcobs bocsk obcsk bcosk cbosk ocbsk cobsk bosck obsck bsock sbock osbck sobck bcsok cbsok bscok sbcok csbok scbok ocsbk cosbk oscbk socbk csobk scobk boksc obksc bkosc kbosc okbsc kobsc boskc obskc bsokc sbokc osbkc sobkc bksoc kbsoc bskoc sbkoc ksboc skboc oksbc kosbc oskbc sokbc ksobc skobc bckso cbkso bkcso kbcso ckbso kcbso bcsko cbsko bscko sbcko csbko scbko bksco kbsco bskco sbkco ksbco skbco cksbo kcsbo cskbo sckbo kscbo skcbo ocksb coksb okcsb kocsb ckosb kcosb ocskb coskb osckb sockb csokb scokb okscb koscb oskcb sokcb ksocb skocb cksob kcsob cskob sckob kscob skcob
Note: these 'words' (valid or invalid) are all the permutations of the word bocks. These words are obtained by scrambling the letters in bocks.