Panic disorder does not require four or more symptoms to all be present at the same time. Causeless panic and racing heartbeat are sufficient to indicate a panic attack. Epidemiology. In Europe about 3% of the population has a panic attack in a given year while in the United States they affect about 11%.
The concept of containers is crucial to MLA style. When the source being documented forms part of a larger whole, the larger whole can be thought of as a container that holds the source. For example, a short story may be contained in an anthology. The short story is the source, and the anthology is the container.
Since the container does not describe how data or metadata is encoded, a program able to identify and open a container file might not be able to decode the contained data. This may be caused by the program lacking the required decoding algorithm. By definition, a container format could wrap any kind of data. Though there are some examples of such file formats (e.g. Microsoft Windows 's DLL files), most container formats are specialized for specific data requirements. For example, a popular family of containers is found for use with multimedia file formats.