acebb caebb aecbb eacbb ceabb ecabb acbeb cabeb abceb baceb cbaeb bcaeb aebcb eabcb abecb baecb ebacb beacb cebab ecbab cbeab bceab ebcab becab acebb caebb aecbb eacbb ceabb ecabb acbeb cabeb abceb baceb cbaeb bcaeb aebcb eabcb abecb baecb ebacb beacb cebab ecbab cbeab bceab ebcab becab acbbe cabbe abcbe bacbe cbabe bcabe acbbe cabbe abcbe bacbe cbabe bcabe abbce babce abbce babce bbace bbace cbbae bcbae cbbae bcbae bbcae bbcae aebbc eabbc abebc baebc ebabc beabc aebbc eabbc abebc baebc ebabc beabc abbec babec abbec babec bbaec bbaec ebbac bebac ebbac bebac bbeac bbeac cebba ecbba cbeba bceba ebcba becba cebba ecbba cbeba bceba ebcba becba cbbea bcbea cbbea bcbea bbcea bbcea ebbca bebca ebbca bebca bbeca bbeca
Note: these 'words' (valid or invalid) are all the permutations of the word acebb. These words are obtained by scrambling the letters in acebb.