decaf edcaf dceaf cdeaf ecdaf cedaf deacf edacf daecf adecf eadcf aedcf dcaef cdaef dacef adcef cadef acdef ecadf ceadf eacdf aecdf caedf acedf decfa edcfa dcefa cdefa ecdfa cedfa defca edfca dfeca fdeca efdca fedca dcfea cdfea dfcea fdcea cfdea fcdea ecfda cefda efcda fecda cfeda fceda deafc edafc daefc adefc eadfc aedfc defac edfac dfeac fdeac efdac fedac dafec adfec dfaec fdaec afdec fadec eafdc aefdc efadc feadc afedc faedc dcafe cdafe dacfe adcfe cadfe acdfe dcfae cdfae dfcae fdcae cfdae fcdae dafce adfce dface fdace afdce fadce cafde acfde cfade fcade afcde facde ecafd ceafd eacfd aecfd caefd acefd ecfad cefad efcad fecad cfead fcead eafcd aefcd efacd feacd afecd faecd cafed acfed cfaed fcaed afced faced
Note: these 'words' (valid or invalid) are all the permutations of the word decaf. These words are obtained by scrambling the letters in decaf.