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Because they rely on the \futurelet primitive, the macros with
optional arguments cannot be expandable. However, it is possible to
make them expandable if there is at least one mandatory argument (see
`Limitations').
This material is subject to the LaTeX Project Public License.
See http://www.ctan.org/tex-archive/help/Catalogue/licenses.lppl.html
for the details of that license.
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