def decode_support_levels(encoded: str, for_sheet: bool=False):
    """
    Decodes the support levels back into a human-readable format
    :param encoded: The encoded support level
    :param for_sheet: Changes the support levels into the format used in the
                      data sheet (e.g. C1 -> CC)
    :return: The decoded support level
    """
    if for_sheet:
        return encoded.replace('1', 'C').replace('2', 'B').replace('3', 'A')
    else:
        return encoded.replace('1', 'C+').replace('2', 'B+').replace('3', 'A+')
