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Some functions are provided by the auto-overlays package for use in new parse and suicide functions. The functions that modify overlays carry out tasks that require interaction with the core of the auto-overlays package, and provide the only reliable way of carrying out those tasks. The other functions are used to query various things about auto-overlays and match overlays. Again, they are the only reliable interface for this, since the internal implementation may change between releases of the auto-overlays package.