r Variables, Variables, Variables -->
<a name="AboutVariables" ></a>
<h3>10.4.1: About variables</h3>

Variables store numbers.  As it reads your program, Gri 
substitutes variable values any place a variable appears where a number
normally would.  For example, in the code below `<font color="#82140F"><code>.number.</code></font>' is a
variable storing the value 10, so the two `<font color="#82140F"><code>read</code></font>' statements have
the same effect:
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