from typing import Counter


def sum_counters(counters):
    """Aggregate collections.Counter objects by summing counts

    :param counters: list/tuple of counters to sum
    :return: aggregated counters with counts summed

    >>> d1 = text_analyzer.Document('1 2 fizz 4 buzz fizz 7 8')
    >>> d2 = text_analyzer.Document('fizz buzz 11 fizz 13 14')
    >>> sum_counters([d1.word_counts, d2.word_counts])
    Counter({'buzz': 2, 'fizz': 4})
    """
    return sum(counters, Counter())