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→Parsing input without exploding your head
As an example, let's consider typesetting chemical molecules in TeX. Normally, molecules should be typeset in text mode rather than math mode.
If we want
:H<sub>43</sub>SO<sub>4</sub><sup>+</sup>,
we must type
:<code>H\low{3}SO\lohi{4}{\textplus}</code>,
