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    @interface NSIndexPath (PSPDFDocumentViewLayout)
     Creates an index path with a given spread index, suitable for use on all the collection
     view methods dealing with index paths instead of spread indexes.
     @param spreadIndex The spread index to express as an index path.
     @return The index path expressing the passed in spread index.
    + (NSIndexPath *)pspdf_indexPathForSpreadAtIndex:(NSInteger)spreadIndex;
     The index identifying the spread in a `PSPDFDocumentViewLayout`.
    @property (nonatomic, readonly) NSInteger pspdf_spreadIndex;