exons xeons eoxns oexns xoens oxens exnos xenos enxos nexos xneos nxeos eonxs oenxs enoxs neoxs onexs noexs xones oxnes xnoes nxoes onxes noxes exosn xeosn eoxsn oexsn xoesn oxesn exson xeson esxon sexon xseon sxeon eosxn oesxn esoxn seoxn osexn soexn xosen oxsen xsoen sxoen osxen soxen exnso xenso enxso nexso xneso nxeso exsno xesno esxno sexno xseno sxeno ensxo nesxo esnxo senxo nsexo snexo xnseo nxseo xsneo sxneo nsxeo snxeo eonsx oensx enosx neosx onesx noesx eosnx oesnx esonx seonx osenx soenx ensox nesox esnox senox nseox sneox onsex nosex osnex sonex nsoex snoex xonse oxnse xnose nxose onxse noxse xosne oxsne xsone sxone osxne soxne xnsoe nxsoe xsnoe sxnoe nsxoe snxoe onsxe nosxe osnxe sonxe nsoxe snoxe
Note: these 'words' (valid or invalid) are all the permutations of the word exons. These words are obtained by scrambling the letters in exons.