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Click the "Build a Header" button to automatically create a sample header of all the state variables that will be available to the Macro during a call. This technique is a wonderful way of identifying all available state variables without having to go through each Node manually. Once the header has been built, modify the values as necessary and test the Macro.
Clicking "Build A Header" while there is an existing header will cause the existing header to be replaced by the automatically generated one.