Question: Write a method named combinations that accepts a string s and an integer k as parameters and outputs all possible k -letter words that can

Write a method named combinations that accepts a string s and an integer k as parameters and outputs all possible k -letter words that can be formed from unique letters in that string. The arrangements may be output in any order.

You should test your method with strings to see if all combinations are displayed. Hint: you may define additional helper methods to assist in the implementation of the method description above.

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