necks encks nceks cneks ecnks cenks nekcs enkcs nkecs knecs ekncs kencs nckes cnkes nkces knces cknes kcnes eckns cekns ekcns kecns ckens kcens necsk encsk ncesk cnesk ecnsk censk nesck ensck nseck sneck esnck senck ncsek cnsek nscek sncek csnek scnek ecsnk cesnk escnk secnk csenk scenk neksc enksc nkesc knesc eknsc kensc neskc enskc nsekc snekc esnkc senkc nksec knsec nskec snkec ksnec sknec eksnc kesnc esknc seknc ksenc skenc nckse cnkse nkcse kncse cknse kcnse ncske cnske nscke sncke csnke scnke nksce knsce nskce snkce ksnce sknce cksne kcsne cskne sckne kscne skcne ecksn ceksn ekcsn kecsn ckesn kcesn ecskn ceskn esckn seckn csekn scekn ekscn kescn eskcn sekcn ksecn skecn cksen kcsen csken scken kscen skcen
Note: these 'words' (valid or invalid) are all the permutations of the word necks. These words are obtained by scrambling the letters in necks.