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Find unique elements in a given list

**Question:**
Write a function called `find_unique_characters` that takes a string as input and returns a new string containing the unique characters from the input string. Use sets to find the unique characters.

**Example:**
Input: "hello"
Output: "helo"
def find_unique_characters(string):
    """
    Finds the unique characters in a given string.

    Args:
        string (str): The input string.

    Returns:
        str: A new string with the unique characters.
    """
    # TODO: Implement the find_unique_characters function
    pass
Intermediate setsstrings
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