2.1.286 Part 1 Section 17.9.17, numFmt (Numbering Format)
a. The standard does not specify behavior when numFmt is bullet but lvlText is also set.
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If the numFmt is bullet, Word will use the literal text in lvlText, ignoring %x syntax in lvlText.
b. The standard states that the format attribute takes precedence over the val attribute.
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Word ignores the format attribute unless the value of the val attribute is equal to "custom".