<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def remove_accent_marks(text, excluded=None):
 """Remove accent marks from input text. This function removes accent marks in the text, but leaves unicode characters defined in the 'excluded' parameter. Args: text: The text to be processed. excluded: Set of unicode characters to exclude. Returns: The text without accent marks. """

        if excluded is None:
            excluded = set()

        return unicodedata.normalize(
            'NFKC', ''.join(
                c for c in unicodedata.normalize(
                    'NFKD', text) if unicodedata.category(c) != 'Mn' or c in excluded))