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Words - K Length Words - 3

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2. Think of a solution approach, then try and submit the question on editor tab.
3. We strongly advise you to watch the solution video for prescribed approach.

1. You are given a word (may have one character repeat more than once).
2. You are given an integer k.
3. You are required to generate and print all k length words by using chars of the word.

Note -> Use the code snippet and follow the algorithm discussed in question video. The judge can't force you but the intention is to teach a concept. Play in spirit of the question.
Input Format 
Input is managed for you
Output Format 
Check the sample ouput and question video.
Question Video

Constraints 
0 < str.length() < 15
0 < k <= str.length()
Sample Input 
aaabb
3
Sample Output 
aaa
aab
aba
baa
abb
bab
bba


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