@staticmethod
def find_frequent_items(transactions, threshold):
    """
        Create a dictionary of items with occurrences above the threshold.
        """
    items = {}
    for transaction in transactions:
        for item in transaction:
            if item in items:
                items[item] += 1
            else:
                items[item] = 1
    for key in list(items.keys()):
        if items[key] < threshold:
            del items[key]
    return items
