Vienna01, I'm confused. I have always heard that widow/orhpan referenced the last and first few lines on a physical page. Most times two lines are required on each. Thus if the page breaks with only one line at the bottom of the page, the line would be moved to the following page. If only one line would be at the start of the following page the page break is moved back one line unless that would leave only one line on the first page then both would be moved to the following page. I have never seen it referenced to whole sentances or paragraphs.
More critical from my view would be keeping the headers together with the following text. Few things are more jarring than to see a header as the last line of a page and have to turn the page to start the associated paragraph. Just my two cents.
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