nt</code> - the segment to start searching at. To start at the 
                        beginning of the curve, use 1, not 0.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the point at which this curve intersects the boundary of 
 the given rectangle, if it does so. If it does not intersect, 
 -1 is returned</dd>
</dl>
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