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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 load_operations_from_docstring(docstring):
 """Return a dictionary of OpenAPI operations parsed from a a docstring. """

    doc_data = load_yaml_from_docstring(docstring)
    return {
        key: val
        for key, val in iteritems(doc_data)
        if key in PATH_KEYS or key.startswith("x-")
    }