chaff hcaff cahff achff hacff ahcff chfaf hcfaf cfhaf fchaf hfcaf fhcaf cafhf acfhf cfahf fcahf afchf fachf hafcf ahfcf hfacf fhacf afhcf fahcf chaff hcaff cahff achff hacff ahcff chfaf hcfaf cfhaf fchaf hfcaf fhcaf cafhf acfhf cfahf fcahf afchf fachf hafcf ahfcf hfacf fhacf afhcf fahcf chffa hcffa cfhfa fchfa hfcfa fhcfa chffa hcffa cfhfa fchfa hfcfa fhcfa cffha fcfha cffha fcfha ffcha ffcha hffca fhfca hffca fhfca ffhca ffhca caffh acffh cfafh fcafh afcfh facfh caffh acffh cfafh fcafh afcfh facfh cffah fcfah cffah fcfah ffcah ffcah affch fafch affch fafch ffach ffach haffc ahffc hfafc fhafc afhfc fahfc haffc ahffc hfafc fhafc afhfc fahfc hffac fhfac hffac fhfac ffhac ffhac affhc fafhc affhc fafhc ffahc ffahc
Note: these 'words' (valid or invalid) are all the permutations of the word chaff. These words are obtained by scrambling the letters in chaff.