2.1.354 Part 1 Section 17.13.6, Bookmarks
a. The standard allows a bookmark to begin inside a math object and end outside that object or vice versa.
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Word does not allow a bookmark to begin inside a math object and end outside that object or vice versa.
b. The standard does not specify a maximum number of bookmarks allowed in a document.
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Word fails to open the file if it has too many bookmarks (more than 16380 when the uiCompat97to2003 element is present, more than 2147483647 otherwise).