nyfac ynfac nfyac fnyac yfnac fynac nyafc ynafc nayfc anyfc yanfc aynfc nfayc fnayc nafyc anfyc fanyc afnyc yfanc fyanc yafnc ayfnc faync afync nyfca ynfca nfyca fnyca yfnca fynca nycfa yncfa ncyfa cnyfa ycnfa cynfa nfcya fncya ncfya cnfya fcnya cfnya yfcna fycna ycfna cyfna fcyna cfyna nyacf ynacf naycf anycf yancf ayncf nycaf yncaf ncyaf cnyaf ycnaf cynaf nacyf ancyf ncayf cnayf acnyf canyf yacnf aycnf ycanf cyanf acynf caynf nfacy fnacy nafcy anfcy fancy afncy nfcay fncay ncfay cnfay fcnay cfnay nacfy ancfy ncafy cnafy acnfy canfy facny afcny fcany cfany acfny cafny yfacn fyacn yafcn ayfcn faycn afycn yfcan fycan ycfan cyfan fcyan cfyan yacfn aycfn ycafn cyafn acyfn cayfn facyn afcyn fcayn cfayn acfyn cafyn
Note: these 'words' (valid or invalid) are all the permutations of the word nyfac. These words are obtained by scrambling the letters in nyfac.