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→Expressions: I removed the "optional" for \relax. It actually isn't, except in a controlled environment
by one of the commands <code>\numexpr</code>, <code>\dimexpr</code>,
<code>\glueexpr</code>, or <code>\muexpr</code>
(determining the type <i>t</i>) and optionally terminated by one <code>\relax</code> (thatwhich
will be absorbed by the scanning mechanism). An expression consists of one
or more terms of the same type to be added or subtracted; a term of type <i>t</i>
