oonce oonce onoce nooce onoce nooce oocne oocne ocone coone ocone coone oncoe nocoe ocnoe conoe ncooe cnooe oncoe nocoe ocnoe conoe ncooe cnooe oonec oonec onoec nooec onoec nooec ooenc ooenc oeonc eoonc oeonc eoonc oneoc noeoc oenoc eonoc neooc enooc oneoc noeoc oenoc eonoc neooc enooc oocen oocen ocoen cooen ocoen cooen ooecn ooecn oeocn eoocn oeocn eoocn oceon coeon oecon eocon ceoon ecoon oceon coeon oecon eocon ceoon ecoon onceo noceo ocneo coneo ncoeo cnoeo oneco noeco oenco eonco neoco enoco oceno coeno oecno eocno ceono econo nceoo cneoo necoo encoo cenoo ecnoo onceo noceo ocneo coneo ncoeo cnoeo oneco noeco oenco eonco neoco enoco oceno coeno oecno eocno ceono econo nceoo cneoo necoo encoo cenoo ecnoo
Note: these 'words' (valid or invalid) are all the permutations of the word oonce. These words are obtained by scrambling the letters in oonce.