yechs eychs ycehs cyehs ecyhs ceyhs yehcs eyhcs yhecs hyecs ehycs heycs yches cyhes yhces hyces chyes hcyes echys cehys ehcys hecys cheys hceys yecsh eycsh ycesh cyesh ecysh ceysh yesch eysch ysech syech esych seych ycseh cyseh ysceh syceh csyeh scyeh ecsyh cesyh escyh secyh cseyh sceyh yehsc eyhsc yhesc hyesc ehysc heysc yeshc eyshc ysehc syehc esyhc seyhc yhsec hysec yshec syhec hsyec shyec ehsyc hesyc eshyc sehyc hseyc sheyc ychse cyhse yhcse hycse chyse hcyse ycshe cyshe ysche syche csyhe scyhe yhsce hysce yshce syhce hsyce shyce chsye hcsye cshye schye hscye shcye echsy cehsy ehcsy hecsy chesy hcesy ecshy ceshy eschy sechy csehy scehy ehscy hescy eshcy sehcy hsecy shecy chsey hcsey cshey schey hscey shcey
Note: these 'words' (valid or invalid) are all the permutations of the word yechs. These words are obtained by scrambling the letters in yechs.