note sundialsvc4 <p> To clarify the above ... the <tt>sort</tt> verb allows a comparison subroutine to be specified.   That can be as simple as the “one-liner” in-between (and including) the curly braces, which uses the <tt><=></tt> operator designed expressly for this purpose, or it can be a much more complicated function.   Within that function, for your further convenience, the variables <tt>$a</tt> and <tt>$b</tt> are magically defined. </p> 1018610 1018610