2.1.250 Part 1 Section 17.7.6.4, tblPr (Style Table Properties)
a. The standard states that the bidiVisual, tblLayout, tblLook, tblOverlap, tblpPr, tblStyle, and tblW elements are valid child elements of the tblPr element.
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Word does not allow these elements to be child elements of the tblPr element.