[Java] Easy to understand - Backtracking + Bitmasks
https://github.com/Freeze777/SDE-Interviewer-Notes/blob/main/LeetCodeJava/src/main/java/leetcode/medium/backtracking/MaxLengthConcatenation.java
https://github.com/Freeze777/SDE-Interviewer-Notes/blob/main/LeetCodeJava/src/main/java/leetcode/medium/backtracking/MaxLengthConcatenation.java
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