2.1.410 Part 1 Section 17.15.1.59, noLineBreaksBefore (Custom Set Of Characters Which Cannot Begin A Line)
a. The standard does not state how conflicts between this element and the strictFirstAndLastChars element should be resolved.
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Word ignores this element when the strictFirstAndLastChars element is also specified.
b. The standard does not limit the length of the value of the val attribute.
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Word restricts the value of this attribute to be at most 100 characters.