Combination Sum: Given an array of distinct integers candidates and a target integer target, return a list of all unique combinations of candidates where the chosen numbers sum to target.
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Combinations: Given two integers n and k, return all possible combinations of k numbers chosen from the range [1, n].
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Permutations II: Given a collection of numbers, nums, that might contain duplicates, return *all possible unique permutations in any order*.
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Permutations: Given an array nums of distinct integers, return all the possible permutations.
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Subsets II: Given an integer array nums that may contain duplicates, return all possible subsets (the power set).
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Subsets: Given an integer array nums of unique elements, return all possible subsets (the power set).
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