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Words - K Selection - 2

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1. You are given a word (may have one character repeat more than once).
2. You are given an integer k.
2. You are required to generate and print all ways you can select k distinct characters out 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 
aabbbccdde
3
Sample Output 
abc
abd
abe
acd
ace
ade
bcd
bce
bde
cde


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