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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 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