def METHOD_NAME(self, key, data):
    """
    Modify the intervals on a second loop once all the data has been collected. This is particularly useful for
    lists or sets of items that were collected.
    """
    # Ensure that all lists are sets (i.e. contain only unique values)
    data['Mentions'] = set(data['Mentions'])
    data['Hashtags'] = set(data['Hashtags'])
    data['URLs'] = set(data['URLs'])
    # Collect Aggregate data
    data['Number of unique Mentions used in Tweets'] = len(data['Mentions'])
    data['Number of unique Hashtags used in Tweets'] = len(data['Hashtags'])
    data['Number of unique URLs used in Tweets'] = len(data['URLs'])
    # Delete unused fields
    data.pop('URLs')
    data.pop('Mentions')
    data.pop('Hashtags')
    data.pop('Created at Timestamp')
    return data