n expression types are used to create new kinds of syntax
and bind syntactic keywords to those new syntaxes, while other
expression types create new locations and bind variables to those
locations.  These expression types are called <em>binding constructs</em>.
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Those that bind syntactic keywords are listed in section&nbsp;<a href="r5rs-Z-H-7.html#%_sec_4.3">4.3</a>.
The most fundamental of the variable binding constructs is the
<tt>lambda</tt> expression, because all other variable b