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Please help with the below code, especially the error handling to not enter repeated characters as input. SOLVE IN PYTHON: A reordering of the letters

Please help with the below code, especially the error handling to not enter repeated characters as input. SOLVE IN PYTHON: A reordering of the letters of a word is called a permutation of the word. A word of n different characters has n! permutations where n! = n * (n-1) * (n-2) * . . . * 2 * 1.

For instance, the word python has 6! or 720 permutations. Some of its permutations are pythno, ypntoh, and ontphy. Write a program that requests a word without repeated characters as input and then displays all the permutations of the word. See below for output result.

Hint: Suppose the word has six characters. Consider the characters of the word one at a time. Then display the words beginning with that character and followed by each of the 5! permutations of the remaining characters of the word.

Output: Enter a word: ear ear, era, aer, are, rea, rae

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