tucks utcks tcuks ctuks uctks cutks tukcs utkcs tkucs ktucs uktcs kutcs tckus ctkus tkcus ktcus cktus kctus uckts cukts ukcts kucts ckuts kcuts tucsk utcsk tcusk ctusk uctsk cutsk tusck utsck tsuck stuck ustck sutck tcsuk ctsuk tscuk stcuk cstuk sctuk ucstk custk usctk suctk csutk scutk tuksc utksc tkusc ktusc uktsc kutsc tuskc utskc tsukc stukc ustkc sutkc tksuc ktsuc tskuc stkuc kstuc sktuc ukstc kustc usktc suktc ksutc skutc tcksu ctksu tkcsu ktcsu cktsu kctsu tcsku ctsku tscku stcku cstku sctku tkscu ktscu tskcu stkcu kstcu sktcu ckstu kcstu csktu scktu ksctu skctu uckst cukst ukcst kucst ckust kcust ucskt cuskt usckt suckt csukt scukt uksct kusct uskct sukct ksuct skuct cksut kcsut cskut sckut kscut skcut
Note: these 'words' (valid or invalid) are all the permutations of the word tucks. These words are obtained by scrambling the letters in tucks.