This file header token allows you to specify that an additional template is to be processed after the processing of the current template completes. The name of the additional template to process is specified between the opening and closing tags to the token.
File header tokens must be grouped together at the top of the template file.
Here's the Configuring Template Dependencies video. Make sure you select a high-definition version of the video, by default YouTube tends to play the lowest resolution which can look pretty awful!
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