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  will be replaced by the value of the last variable. This allows nested
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  will be replaced by the value of the last variable. This allows nested
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  substitutions, as well as substitution of a variable which is followed
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  substitutions, as well as substitution of a variable which is followed
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  by an alphanumeric character.
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  by an alphanumeric character.
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  <br>Example: if the variable $(emph)i$emphend has value $(emph)3$emphend
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  <br>Example: if the variable $(emph)i$emphend has value $(emph)3$emphend
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  and the variable $(emph)alpha3beta$emphend has value $(emph)pi$emphend,
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  and the variable $(emph)alpha3beta$emphend has value $(emph)pi$emphend,
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  the string<pre>
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  the string<pre>3*$$(alpha$$(i)beta)*x</pre>
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  3*$$(alpha$$(i)beta)*x</pre>will become<pre>
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  will become<pre>3*pi*x</pre>
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  3*pi*x</pre>after substitution.
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  after substitution.
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  <p>
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  <p>
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  Array addressing: if the variable $(emph)l$emphend contains a
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  Array addressing: if the variable $(emph)l$emphend contains a
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  comma-separated list $(emph)a,b,c,d,e$emphend, then the string
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  comma-separated list $(emph)a,b,c,d,e$emphend, then the string
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  <tt>$$(i[3])</tt> gives <tt>c</tt> after substitution, and
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  <tt>$$(i[3])</tt> gives <tt>c</tt> after substitution, and
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  <tt>$$(i[2 to 4])</tt> tives <tt>b,c,d</tt>, etc.
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  <tt>$$(i[2 to 4])</tt> tives <tt>b,c,d</tt>, etc.
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  <p>
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  <p>
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  Two-dimensional array addressing is also available: if
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  Two-dimensional array addressing is also available: if
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  <p><center><tt>$$M=x,y,z;a,b,c</tt>
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  <pre>$$M=x,y,z;a,b,c</pre>
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  </center> <p>
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  (a 2x3 matrix), then
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  (a 2x3 matrix), then
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  <p><center>
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  <tt> $$(M[1;3,2])=z,y </tt>
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  <pre>$$(M[1;3,2])=z,y</pre>
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  </center> <li><p>If the character $emph$$$emphend is followed by the left bracket
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  <li>If the character $emph$$$emphend is followed by the left bracket
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  $emph[$emphend, the matching $emph]$emphend will be located, the content
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  $emph[$emphend, the matching $emph]$emphend will be located, the content
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  of the pair of brackets substituted then evaluated to a real number value whose
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  of the pair of brackets substituted then evaluated to a real number value whose
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  precision depends on the value of $emph print_precision$emphend.
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  precision depends on the value of $emph print_precision$emphend.
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  This value will replace the whole thing
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  This value will replace the whole thing
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  together with the leading $emph$$$emphend. <br>
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  together with the leading $emph$$$emphend. <br>