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operators;
* - numbers;
* - text.

Note, however, that these token elements may be used as extension points, allowing markup in host languages.MathML in HTML5 allows most inline HTML markup in mtext, and is conforming, with the HTML markup being used within the MathML to mark up the embedded text (making the first word bold in this example).

These are combined using layout elements, that generally contain only elements. They include:
* - a horizontal row of items;
* , , and

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