Given the structure of your document, you can't even be sure columns are in use on a given page without looking closely at the formatting marks. On page 6, for example, there appear to be 3 columns but there are only 2 - the right side of the page is all part of the 2nd column, which begins about 5cm from the left margin. The vertical line is just that - not a column divider.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]