fonet ofnet fnoet nfoet onfet nofet foent ofent feont efont oefnt eofnt fneot nfeot fenot efnot nefot enfot oneft noeft oenft eonft neoft enoft fonte ofnte fnote nfote onfte nofte fotne oftne ftone tfone otfne tofne fntoe nftoe ftnoe tfnoe ntfoe tnfoe ontfe notfe otnfe tonfe ntofe tnofe foetn ofetn feotn efotn oeftn eoftn foten often ftoen tfoen otfen tofen feton efton fteon tfeon etfon tefon oetfn eotfn otefn toefn etofn teofn fneto nfeto fento efnto nefto enfto fnteo nfteo ftneo tfneo ntfeo tnfeo fetno eftno fteno tfeno etfno tefno netfo entfo ntefo tnefo etnfo tenfo onetf noetf oentf eontf neotf enotf ontef notef otnef tonef ntoef tnoef oetnf eotnf otenf toenf etonf teonf netof entof nteof tneof etnof tenof
Note: these 'words' (valid or invalid) are all the permutations of the word fonet. These words are obtained by scrambling the letters in fonet.