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Apply the Heading 2 style to the text:
Article IV
Article V
Article VI
Article VII
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Apply the Section style to text in each of the 4 sections in Article II.
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Insert a Section Break before Article V, Article VI, and Article VII.
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Create a different header for each section so the article number appears in the header.
When you're finished, the document should look like this:

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Save the document in the Writer Documents folder, then close it.