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Find Unique Characters in a String

Write a function `find_unique_characters(string)` that returns a string containing each distinct character from the input exactly once.

Keep the first occurrence of each character and preserve the original order.

#### 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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