ancef nacef acnef canef ncaef cnaef anecf naecf aencf eancf neacf enacf acenf caenf aecnf eacnf ceanf ecanf nceaf cneaf necaf encaf cenaf ecnaf ancfe nacfe acnfe canfe ncafe cnafe anfce nafce afnce fance nface fnace acfne cafne afcne facne cfane fcane ncfae cnfae nfcae fncae cfnae fcnae anefc naefc aenfc eanfc neafc enafc anfec nafec afnec fanec nfaec fnaec aefnc eafnc afenc faenc efanc feanc nefac enfac nfeac fneac efnac fenac acefn caefn aecfn eacfn ceafn ecafn acfen cafen afcen facen cfaen fcaen aefcn eafcn afecn faecn efacn feacn cefan ecfan cfean fcean efcan fecan ncefa cnefa necfa encfa cenfa ecnfa ncfea cnfea nfcea fncea cfnea fcnea nefca enfca nfeca fneca efnca fenca cefna ecfna cfena fcena efcna fecna
Note: these 'words' (valid or invalid) are all the permutations of the word ancef. These words are obtained by scrambling the letters in ancef.