Log that duplicates were found.

    :param counts: A list of duplicate marker names along with their number
                   of occurences.
    :type counts: list

def found_duplicates(counts):
    """Log that duplicates were found.

    :param counts: A list of duplicate marker names along with their number
                   of occurences.
    :type counts: list

    """
    _logger.warning("Duplicated markers found")
    for marker, count in counts:
        _logger.warning(" - {}: {:,d} times".format(marker, count))
    _logger.warning("Appending ':dupX' to the duplicated markers according "
                    "to their location in the file.")