LeetCode
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It has duplicate elements in the solution sample that's been mentioned in the problem statement
https://github.com/codeyu/LeetCode/blob/0fd7a303038e6dbd81e1633133dbd85e779a2f76/Algorithms/CombinationSumII.cs#L28
In line 16 you have told solution should not contain duplicate elements
It's "not contain duplicate combinations".