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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.