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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 unallocated():
 """ Identify unallocated holdings """

    app = AppAggregate()
    app.logger = logger
    unalloc = app.find_unallocated_holdings()

    if not unalloc:
        print(f"No unallocated holdings.")

    for item in unalloc:
        print(item)